Puzzle | 3 Priests and 3 devils Puzzle Last Updated : 18 Jan, 2023 Comments Improve Suggest changes Like Article Like Report There are 3 devils and 3 Priests.They all have to cross a river in a boat.Boat can only carry two people at a time.As long as there are equal number of devils and priests,then devils will not eat Priest.If the number of devils are greater than the number of priests on the same side of the river then devils will eat the priests.So how can we make all the 6 peoples to arrive to the other side safely? Solution: To arrive all the priests and devils to the other side, 6 steps are to be followed:- 1) Firstly one devil and one priest will go to the other side. Devil will stay to the other side while priest will come back with the boat. 2) Remaining two devils will go to the other side. One devil will stay to the other side while one devil will come again with the boat.So total two devils are on the another side of river and 3 priests and 1 devil is on the one side of the river. 3) Now two priests will go. One priest will stay while 1 priest and 1 devil come back with the boat. 4) Now remaining two priests will go to the other side of the river. Total 3 priests and 1 devil is on the one side while 2 devils is on the another side of the river. 1 devil will come back with the boat. 5) 2 devils will go to the other side of the river. 1 devil will stay and 1 devil will again go back with the boat. 6) Now the remaining 2 devils will come to the other side of the river. All the 3 priests and 3 devils arrive safely. Comment More infoAdvertise with us Next Article Puzzle | Farmer, Goat, Wolf and Cabbage R Rakesh Kumar Improve Article Tags : Aptitude Logical Puzzles Similar Reads Puzzles Puzzles are commonly asked in exams and interviews to test logical and analytical thinking. Here is a list of most asked Puzzles divided into four categories as per examination pattern. 1. Analytical / Mathematical PuzzlesPuzzle TitleAsked in CompanyFind ages of daughtersGoogle, MicrosoftCalculate t 4 min read Mathematical/Analytical PuzzlePuzzle 1 | (How to Measure 45 minutes using two identical wires?)How do we measure forty-five minutes using two identical wires, each of which takes an hour to burn? We have matchsticks with us. The wires burn non-uniformly. So, for example, the two halves of wire might burn in 10 minutes and 50 minutes respectively. Puzzle 1 | (How to Measure 45 minutes using tw 1 min read Puzzle - Find the ages of daughtersAlok has three daughters. His friend Shyam wants to know the ages of his daughters. Alok gives him a first hint. 1. The product of their age is 72. Shyam says this is not enough information Alok gives him a second hint. 2. The sum of their ages is equal to my house number. Shyam goes out and looks a 3 min read Puzzle - Calculate total distance travelled by beePuzzle: Two trains are on same track and they are coming toward each other. The speed of the first train is 50 km/h and the speed of the second train is 70 km/h. A bee starts flying between the trains when the distance between two trains is 100 km. The bee first flies from first train to second trai 2 min read Monty Hall problemThe Monty Hall problem is a surprising probability puzzle:There are 3 doors—two hide goats, and one hides a car.You pick one door (let’s call it door 2), hoping it has the car.The game show host, Monty Hall, then looks at the other two doors (1 and 3) and opens one that has a goat behind it (Say 3). 2 min read Puzzle 16 | (100 Doors)There are 100 doors in a row, all doors are initially closed. A person walks through all doors multiple times and toggle (if open then close, if close then open) them in the following way: In the first walk, the person toggles every door In the second walk, the person toggles every second door, i.e. 2 min read Puzzle - Torch and BridgeThere are 4 people (A, B, C, and D) who want to cross a bridge at night.A takes 1 minute to cross the bridge.B takes 2 minutes to cross the bridge.C takes 5 minutes to cross the bridge.D takes 8 minutes to cross the bridge.There is only one torch with them and the bridge cannot be crossed without th 2 min read Puzzle - 2 Eggs and 100 Floors The following is a description of the instance of this famous puzzle involving 2 eggs and a building with 100 floors. Suppose that we wish to know which stories in a 100-storey building are safe to drop eggs from, and which will cause the eggs to break on landing. What strategy should be used to dro 3 min read Puzzle 12 | (Maximize probability of White Ball)There are two empty bowls in a room. You have 50 white balls and 50 black balls. After you place the balls in the bowls, a random ball will be picked from a random bowl. Distribute the balls (all of them) into the bowls to maximize the chance of picking a white ball. Explanation: First, let us assum 1 min read Puzzle 27 | (Hourglasses Puzzle)Puzzle: Given two hourglass of 4 minutes and 7 minutes, the task is to measure 9 minutes. Solution: At 0 minutes: Start both hourglasses at the same time. At 4 minutes: 4 minutes hourglass runs out and flip it. 7 minutes hourglass is left with 3 minutes. At 7 minutes: 4 minutes hourglass is left wit 1 min read Puzzle 17 | (Ratio of Boys and Girls in a Country where people want only boys)In a country, all families want a boy. They keep having babies till a boy is born. What is the expected ratio of boys and girls in the country? Solution: Assumptions: Probability of having a boy or girl is same. Also, the probability of next kid being a boy doesn't depend on history. The problem can 2 min read Puzzle 29 | (Car Wheel Puzzle)Puzzle: A car has 4 tyres and 1 spare tyre. Each tyre can travel a maximum distance of 20000 km before wearing off. What is the maximum distance the car can travel before you are forced to buy a new tyre? You are allowed to change tyres (using the spare tyre) an unlimited number of times.  Answer: 6 min read Puzzle 22 | (Maximum Chocolates)You have 15 Rs with you. You go to a shop and shopkeeper tells you price as 1 Rs per chocolate. He also tells you that you can get a chocolate in return of 3 wrappers. How many maximum chocolates you can eat? Answer: 22 Buy and eat 15 chocolates Return 15 wrappers and get 5 more chocolates. Return 3 1 min read Puzzle 28 | (Newspaper Puzzle)Question: A newspaper made of 16 large sheets of paper folded in half. The newspaper has 64 pages altogether. The first sheet contains pages 1, 2, 63, 64. If we pick up a sheet containing page number 45. What are the other pages that this sheet contains? Answer: On the back of 45, it is 46. The page 1 min read Puzzle 33 | ( Rs 500 Note Puzzle )A Lady (L) bought an item of Rs 100 from the Shopkeeper (C). She paid him through a 500 Rs Note. Realizing that he did not have change, the shopkeeper C got change for that note from another shopkeeper (S) and paid Rs 400 to the Lady. After a few days, S realized that the note is fake, And this rail 1 min read Puzzle 39 | (100 coins puzzle)This puzzle is similar to 10 Coins Puzzle. Question: 100 coins are lying flat on a table. 10 of them are heads up and 90 are tails up.You can't see which one is which.How can we split the coins into two piles such that there are same number of heads up in each pile? Note: It is allowed to flip the c 1 min read Puzzle 44 | Girl or BoyThe Boy or Girl problem is a set of probability questions that have sparked much discussion among mathematicians. However, here’s a puzzle for you that has a clear and unambiguous answer.Suppose that I have a friend whose name is Ankur. Ankur has his elder brother who got married 10 years before. Bu 4 min read Puzzle 26 | (Know Average Salary without Disclosing Individual Salaries)Three Employees want to know the average of their salaries. They are not allowed to share their individual salaries. Answer: Follow these steps Step 1) X adds a Random Number and his salary and tells the sum to Y. Step 2) Y also adds a Random Number and his salary to the sum told by X and tells new 1 min read Puzzle 37 | (Maximum run in cricket)Question: In a one day international cricket match, considering no extras(no wides, no 'no' balls, etc.) and no overthrows. What is the maximum number of runs that a batsman can score in an ideal case ? Note:"Here we assume ideal and little practical scenario. We assume that batsman can not run for 1 min read Puzzle 32| (Completion of Task)A man is allocated a task. He doubles the task done everyday. If the man completely does the task in 18 days, how many days did it take for the man to complete 25% of the task? Answer: 16 w 100% of task = 18 days As he doubles the task everyday. So, 50% of task = 17 days 25% of task = 16 days. Alter 2 min read Puzzle 40 | (Find missing Row in Excel)We are given an excel sheet which contains integers from 1 to 50, including both. However, the numbers are in a jumbled form and there is 1 integer missing. You have to write a code to identify the missing integer. Only the logic is required. Solution: We know that the sum of all the numbers from 1 1 min read Four People on a Rickety BridgeQuestion: Four people need to cross a rickety bridge at night. Unfortunately, they have one torch and the bridge is too dangerous to cross without a torch. The bridge can support only two people at a time. All the people don't take the same time to cross the bridge. Time for each person: 1 min, 2 mi 2 min read Puzzle | Man fell in well PuzzleA man fell into a 50m deep well. He climbs 4 meters up and slips 3 meters down in one day. How many days would it take for him to come out of the well?Puzzle - Men fell in wellAnswer below-47 daysExplanation:On the first day, the man climbs 4 meters up and slips 3 meters down, therefore, he only cli 1 min read Puzzle | 50 red marbles and 50 blue marblesGive two boxes B1 and B2 one have 50 red marbles and other have 50 blue marbles. A ball is selected randomly from any of the box and the task is to maximize the probability of selecting a red ball, by reshuffling marbles in both the boxes. Solution: Let P(R) be the probability of picking a red marbl 2 min read Puzzle | Bag of CoinsPuzzle: Ishita has 10 bags full of coins. Each bag contains 1000 coins. But one bag is full of forgeries, and she just can't recall which one. She does know that genuine coins weigh 1 gram, but forgeries weigh 1.1 grams. To hide the fact that she can't recall which bag contains forgeries, she needs 2 min read Puzzle | Find the last ball to remain after the entire processProblem Statement: You have 20 Red and 16 Blue balls in a bag. You pull out 2 balls one after another. If the balls are of the same color, then you replace them with a Blue ball – but if they are of different color, you replace them with a Red ball. Once you take out the balls, you do not put them b 3 min read Puzzle | 10 identical bottles of pillsPuzzle: Given 10 identical bottles of identical pills (each bottle contains 100 pills). Out of 10 bottles 9 have 1 gram of pills but 1 bottle has pills of the weight of 1.1 gram. Given a measurement scale, how would you find the heavy bottle? You can use the scale only once. Solution: Step 1: Arrang 2 min read Hungry Worm and Old Tree Riddle | PuzzleProblem Statement: A very hungry worm reaches a tree and eats the leaves in the following sequence: DAY 1: The worm eats 1 leafDAY 2: TWICE( DAY 1)= 2 leavesDAY 3: TWICE( DAY 2)= 4 leavesDAY 4: TWICE( DAY 3)= 8 leaves and so on.....(up to 30 days) The above eating sequence continues for 30 days and 2 min read Puzzle 85 | Chain Link PuzzleYou have five pieces of chain, each consisting of three links. You want to make one long chain of these five pieces. Breaking open a link costs 1 Rs, and welding an open link costs 3 Rs. Is it possible to make one long chain of the five pieces, if you have just 15 Rs? Solution: Let us name the chain 1 min read Interview Puzzle | The shopkeeper and the lady who made a purchase of Rs 200 with fake notePuzzle: A lady makes a purchase of Rs 200/- in a store. The shopkeeper sells the goods with zero profit. He receives a Rs 1000/- note from the lady. The shopkeeper gets the change from the next shop, retains Rs.200 for himself, and gives the lady Rs.800 back. Later, the shopkeeper at the next shop c 1 min read Puzzle | Snail and WallPuzzle: A snail wishes to reach a water shore. To do this it must cross a wall which is 30 feet high. It has a time limit of 30 hours to reach atop the wall. The time starts as soon as it starts climbing the wall. However, he faces a problem while climbing. Every hour it climbs the wall 3 feet up, i 1 min read Puzzle 45 | Gem in PocketsVijay Dinanath Chauhan aka “VDC†was travelling from Bangalore to New Delhi along with his friends. VDC was wearing a Cargo Jeans with finite number of small pockets. And in his pockets, there were packets of gems, not the real ones,actually the Cadbury gems to eat when he reaches Delhi.In each pock 2 min read Pizza PuzzleProblem Statement: At a restaurant, pizzas can be ordered in boxes of 6, 9, and 20. What is the highest number of Pizzas that cannot be bought with any combination of these boxes? For Example: There exist two types of solutions for such a problem.They include mathematical and algorithmic ones.The ma 3 min read Puzzle 49 | King and his ElephantsA king dies after writing an agreement to divide the elephant power to his three sons, the first son has to get 1/2 of elephants, second son gets 3/4th of remaining elephants left after giving away to the first son, third son gets 1/2th of remaining elephants left after giving away to the second son 1 min read Puzzle | Find the box which contains Box of 11 gm CigarettesSuppose you have 10 boxes and each box contains 10 Cigarettes. 9 out of 10 boxes have each Cigarette of 10 gm. Remaining 1 box has each Cigarette of 11 gm. The task is to find the box which contains 11gm Cigarettes. Constraint: You have an electronic weighing machine and with the help of that you ha 2 min read Puzzle | How much he had initially?Puzzle: Rama started on a quest of visiting temples, with few coins in his pockets. As soon as he visits any temple, the money in his pocket gets doubled and on his way out, he donates Rs. 100 to each temple. He visits 4 temples on his quest. After visiting the last temple, his pocket is empty of al 2 min read Puzzle | Minimum planes to go around the worldOn an Island, there is an airport that has an unlimited number of identical air-planes. Each air-plane has a fuel capacity to allow it to fly exactly 1/2 way around the world, along a great circle. The planes have the ability to refuel in flight without loss of speed or spillage of fuel. Though the 2 min read Puzzle | Six colored cubeGiven six distinct colors, in how many unique ways can a six faced cube be painted such that no two faces have the same color? Note: Mixing of colors is not allowed. Answer: 30 ways Explanation: To avoid repetitions, let us fix the color of the top face. Hence, the bottom face can be painted in 5 wa 1 min read Logical PuzzlesPuzzle 9 | (Find the fastest 3 horses)There are 25 horses among which you need to find out the fastest 3 horses. You can conduct a race among at most 5 to find out their relative speed. At no point, you can find out the actual speed of the horse in a race. Find out the minimum no. of races which are required to get the top 3 horses. Fin 4 min read Puzzle 5 | (Finding the Injection for Anesthesia)In a Medical Laboratory, you have 240 Injections, one of which is for Anesthesia for a rat. If Anesthesia injection is injected in a rat, it will faint in within 24 hours. You have 5 rats available to determine which one injection contains the Anesthesia. How do you achieve this in 48 hours ? Clarif 3 min read Puzzle 4 | (Pay an employee using a gold rod of 7 units ?)An employee works for an employer for 7 days. The employer has a gold rod of 7 units. How does the employer pay to the employee, so that the number of employee’s rod units increases by one at the end of each day? The employer can make at most 2 cuts in the rod. (Hint- after the end of the day employ 1 min read Puzzle 7 | (3 Bulbs and 3 Switches)There is a room with a door (closed) and three light bulbs inside the room. Outside the room, there are three switches, connected to the bulbs. You may manipulate the switches as you wish, but once you open the door you can’t change them. All bulbs are in working condition and you can open the door 1 min read Puzzle 15 | (Camel and Banana Puzzle)A person has 3000 bananas and a camel. The person wants to transport the maximum number of bananas to a destination which is 1000 KMs away, using only the camel as a mode of transportation. The camel cannot carry more than 1000 bananas at a time and eats a banana every km it travels. What is the max 4 min read Puzzle 8 | (Find the Jar with contaminated pills)Puzzle: You have 5 jars of pills. Each pill weighs 10 grams, except for contaminated pills contained in one jar, where each pill weighs 9 grams. Given a scale, how could you tell which jar had the contaminated pills in just one measurement? Solution: To find the contaminated Jar, follow this step-wi 1 min read Puzzle 10 | (A Man with Medical Condition and 2 Pills)Puzzle: A man has a medical condition that requires him to take two kinds of pills, call them A and B. The man must take exactly one A pill and exactly one B pill each day, or he will die. The pills are taken by first dissolving them in water. The man has a jar of A pills and a jar of B pills. One d 2 min read Puzzle 13 | (100 Prisoners with Red/Black Hats)100 prisoners in jail are standing in a queue facing in one direction. Each prisoner is wearing a hat of color either black or red. A prisoner can see hats of all prisoners in front of him in the queue, but cannot see his hat and hats of prisoners standing behind him. The jailer is going to ask colo 3 min read Puzzle 24 | (10 Coins Puzzle)You are blindfolded and 10 coins are placed in front of you on the table. You are allowed to touch the coins but can’t tell which way up they are by feel. You are told that there are 5 coins head up, and 5 coins tails up but not which ones are which. Can you make two piles of coins each with the sam 1 min read Puzzle 14 | (Strategy for a 2 Player Coin Game)Puzzle: Consider a two-player coin game where each Player A and Player B gets the turn one by one. There is a row of even number of coins, and a player on his/her turn can pick a coin from any of the two corners of the row.  The player that collects coins with more value wins the game. Develop a str 5 min read Puzzle 19 | (Poison and Rat)There are 1000 wine bottles. One of the bottles contains poisoned wine. A rat dies after one hour of drinking the poisoned wine. How many minimum rats are needed to figure out which bottle contains poison in hour.Solution:We need to figure out in hour. We need 10 rats to figure out the poisoned bott 1 min read Puzzle 20 | (5 Pirates and 100 Gold Coins)There are 5 pirates, they must decide how to distribute 100 gold coins among them. The pirates have seniority levels, the senior-most is A, then B, then C, then D, and finally the junior-most is E. Rules of distribution are: The most senior pirate proposes a distribution of coins.All pirates vote on 2 min read Puzzle 31 | (Minimum cut Puzzle)Puzzle: You have got someone working for you for five days and a gold bar to pay him. You must give them a piece of gold at the end of every day. What are the fewest number of cuts to the bar of gold that will allow you to pay him 1/5th each day? Answer: 2 cuts. Solution: Explanation 1: After two cu 2 min read Puzzle 34 | (Prisoner and Policeman Puzzle)Policeman decided to punish the Prisoner and asked him to make a statement. The Prisoner should make such a statement so that he would be alive. If the statement is held true by Policeman, the Prisoner will be hanged to death and if the statement is held false, the Prisoner will be shot dead. Answer 1 min read Puzzle 36 | (Matchstick Puzzle)Question: How to make 4 equilateral triangles with 6 identical match sticks? Method - I: Make a tetrahedron. Method-II: Method - III: Make one equilateral triangle by three sticks . then put each remaining stick on straight line passing through middle points of each two arms of triangle. Method IV: 1 min read Missionaries and CannibalsQuestion: In the missionaries and cannibals problem, three missionaries and three cannibals must cross a river using a boat which can carry at most two people, under the constraint that, for both banks, if there are missionaries present on the bank, they cannot be outnumbered by cannibals (if they w 4 min read Puzzle 41 | (Guess Color of Hat)There are 20 people standing in a line, one behind the other. Each is made to wear a hat, which can either be white or black. There can be any number of white or black hats between 0 and 20. Each person can see the hat of all the persons ahead of him in the line, but not those of the people standing 2 min read Puzzle 43 | Muddy HeadsA mother tells her two children, a boy and a girl, to play without getting dirty. However, while playing, both children get mud on their foreheads. The mother says “At least one of you has a muddy foreheadâ€. She then asks the children to answer “Yes†or “No†to the question: “Do you know whether you 2 min read Puzzle | Heaven and HellThere are two gates, one to hell and the other to heaven. Two gatekeepers, one for each gate. One of them always speaks the truth and the other always lies but you don't know which one guards which gate. You are allowed only one question and you need to find out the gate to heaven. What is the quest 1 min read Puzzle | Mislabeled JarsPuzzle : There are 3 jars, namely, A, B, C. All of them are mislabeled. Following are the labels of each of the jars: A: CandiesB: SweetsC: Candies and Sweets (mixed in a random proportion) You can put your hand in a jar and pick only one eatable at a time. Tell the minimum number of eatable(s) that 1 min read Puzzle | 8 balls problemPuzzle: You are provided with 8 identical balls and a measuring instrument. 7 of the eight balls are equal in weight and one of the eight given balls is defective and weighs less. The task is to find the defective ball in exactly two measurements. Solution: Step 1: Divide the balls into three catego 2 min read Puzzle 51| Cheryl’s Birthday Puzzle and Solution(Wiki) Cheryl's Birthday is the unofficial name given to a mathematics brain teaser that was asked in the Singapore and Asian Schools Math Olympiad, and was posted online on 10 April 2015 by Singapore TV presenter. It is an interesting problem and might be asked in the interviews. It is based on log 3 min read Puzzle | Measure 4L using given 3 bucketsSuppose you have 8L, 5L and a 3L bucket with you. The buckets have no measurement lines on them and you are asked to measure exactly 4L of water using the three buckets. How could you measure exactly 4L water using only those buckets and provided you have as much extra water as you need ? Solution:- 3 min read Puzzle | 3 Priests and 3 devils PuzzleThere are 3 devils and 3 Priests.They all have to cross a river in a boat.Boat can only carry two people at a time.As long as there are equal number of devils and priests,then devils will not eat Priest.If the number of devils are greater than the number of priests on the same side of the river then 2 min read Puzzle | Farmer, Goat, Wolf and CabbageThere is a farmer who wishes to cross a river but he is not alone. He also has a goat, a wolf, and a cabbage along with him. There is only one boat available which can support the farmer and either of the goat, wolf or the cabbage. So at a time, the boat can have only two objects (farmer and one oth 3 min read Puzzle | Water Jug ProblemWe have two water jugs, one measures 4 Gallons (4G) while the other measure 9 Gallons (9G). But there is no measuring label mentioned on either of these two jugs i.e. we cannot know the exact amount filled in the jug. Now, assuming there is an infinite amount of water supply, can we measure all 1G, 2 min read Puzzle | Blind man and PillsPuzzle: A blind man is alone on a deserted island. He has two blue pills and two red pills. He must take exactly one red pill and one blue pill or he will die. How does he do it?Solution:Way 1: Firstly, break each of the pills in half, and as you do this pop one half in your mouth and lay the other 2 min read Puzzle | The Burning CandlesProblem Statement: Given two candles. Each of them burns for one hour. They burn unevenly in different parts though. In addition, let's have a box of matches. Measure 45 minutes and 15 minutes. Solution: Step1: Both ends of the first candle should be lit, but only one end of the second candle should 2 min read Birthday PuzzlePuzzle:On a new year day, two old friends (A and B) meet at a party. As they met after a long time person B wanted person A to guess his birthday. As both friends are not in touch for a long time person A was unable to guess his birthday. So person B decided to give some hints. Below are the hints: 2 min read Puzzle | Rat and Poisonous Milk BottlesYou have 4 bottles of milk. One of them is poisonous while the other 3 are non-poisonous. There is a rat which dies exactly after 10 hours of drinking the poisoned bottle. You have a clock that measures time only in hours. Suggest an optimal strategy to identify the poisoned bottle within 24 hours. 1 min read Measuring 6L water from 4L and 9L bucketsQuestion: Suppose you have a 4 liter jug and a 9 liter bucket . The buckets have no measurement lines on them either. How could you measure exactly 6 liter using only those buckets and you have as much extra water as you need ? Solution: Consider 2 buckets one 4L and other 9L. : Bucket 1 (4L) and Bu 1 min read Puzzle | Six Houses P, Q, R, S, T, and UThere are three houses on each side of the road. These six houses are labeled as P, Q, R, S, T, and U. The houses are of different colors, namely, Red, Blue, Green, Orange, Yellow, and White. The houses are of different heights. T, the tallest house, is exactly opposite to the Red-colored house.The 3 min read Melting Candles | PuzzleProblem Statement: There are two candles of equal lengths but of different thicknesses.The thicker candle lasts for 6 hours while the thinner one lasts for 2 hours lesser than the thicker one.A person lights the two candles at the same time and goes to play.After returning home, the person saw that 3 min read Puzzle 47 | Red Hat vs Blue HatA team of three people decide on a strategy for playing the following game. Each player walks into a room. On the way in, a fair coin is tossed for each player, deciding that player’s hat color, either red or blue. Each player can see the hat colors of the other two players, but cannot see her own h 3 min read Puzzle | Find the CulpritJoe is a person who can't keep his secrets. He is that much careless that all his relatives and friends know his Debit Card PIN. Today Joe makes a profit of $1000. So he decided to throw a party and he invited his 3 friends: Leena, Paul, and Andrew. He was in a hurry to reach the home as soon as pos 2 min read Puzzle 54 | Fill the JugThere are two jugs each of 4 and 3 liters respectively , without any measuring marks. how many minimum steps are required to have 2 liters of water into the 4 litre jug (the jugs can be filled any number of times with water, and they can be emptied any number of times). Note that this puzzle is diff 2 min read Puzzle 46 | Rich or PoorA place has two kinds of residents, Poor, who always tell the truth, and their opposites, Rich, who always lie. You encounter two people A and B. What are A and B if A says “B is a Poor†and B says “The two of us are opposite types†? Answer: Both A and B are Rich Solution: Let p and q be the statem 2 min read Puzzle | Light all the bulbsProblem Statement: Consider a circle with 2014 light bulbs and only 2 of them are on and the rest are off. Anyone can choose any of the bulbs and change the state of the neighboring bulbs. The task is to switch all the 2014 light bulbs on?Solution: Yes, it is possible to get all the light bulbs ON.F 2 min read Puzzle | Distribute the WaterProblem Statement: Suppose there are three containers; container I (3L), container II (5L), container III (8L). Container III is filled with 8L of water while the other two are empty. With the help of these 3 containers, how to distribute the water in equal volumes i.e. 4L in container II and, 4L in 2 min read Puzzle 50 | The Boat WreckageLet’s make this one easy! Ankur with his friends went to river the bank of river Ganges, as the exams are over for fun and recreation. But while crossing to other side of the river, a storm came and he along with fourteen other people are trapped in a boat in the mid of the river. None of them know 2 min read Puzzle | Weight of Heavy BallPuzzle: There are 2187 balls, out of which 1 is heavy. Find the minimum number of attempts the balls have to be weighed for finding out the heavy ball. Solution: The minimum amount of measurements needed to be done will be equal to 7 times. 2187 = 3^7 Step 1: Divide the 2187 balls into 3 equal group 4 min read Puzzle | Guess the bit stringPuzzle: Your friend thinks of an N bit string that will refer to it as a code. The task is to guess the code by asking your friend a series of queries. In each query, you can provide your friend with an N bit string of your choice, and your friend will tell you the number of bits in your string that 3 min read Arrangement PuzzlesPuzzle 11 | ( 1000 Coins and 10 Bags )A dealer has 1000 coins and 10 bags. He has to divide the coins over the ten bags so that he can make any number of coins simply by handing over a few bags. How must divide his money into the ten bags? Find the ages of daughters Solution: The idea of filling coins in the powers of 2 can be get from 2 min read Puzzle 23 | (Days of month using 2 dice)Puzzle: How can you represent days of month using two 6 sided dice? You can write one number on each face of the dice from 0 to 9 and you have to represent days from 1 to 31, for example for 1, one dice should show 0 and another should show 1, similarly for 29 one dice should show 2 and another shou 2 min read Puzzle 38 | (Tic Tac Toe Puzzle)Statement: The game of Tic-Tac-Toe is being played between two players and it is in below state after six moves. Can you answer following questions? Who will win the game, O or X? Which was the sixth mark and at which position? Assume that both the players are intelligent enough. Solution: X will wi 1 min read Puzzle 30 | (Last Palindrome Date Before 10/02/2001)In year 2001 on October 2, 2001, the date in MMDDYYYY format was a palindrome (same forwards as backwards), 10/02/2001 -> "10022001" When was the last palindrome date before 10/02/2001? Answer: One year can have only one palindrome as the year fixes the month and date too, so the year has to be l 1 min read Puzzle 42 | (Placing the numbers)Place the numbers 1, 2, 3, 4, 5, 6, 7, 8 into the eight circles in figure given below, in such a way that no number is adjacent to a number that is next to it in the sequence.For example 1 should not be adjacent to 2 but can be adjacent to 3, 4, 5, 6, 7, 8. Similarly for others. We strongly recommen 2 min read Puzzle | 10 Balls in 5 LinesPuzzle: Given are ten balls, the task is to place these 10 balls in five lines such that each line contain exactly 4 balls. Solution: The solution to the above puzzle can be obtained as: Draw the star with a pentagon in the centre. Place each ball at the intersection of extended lines of pentagon Th 1 min read Puzzle | (Round table coin game)Suppose two player, player A and player B have the infinite number of coins. Now they are sitting near a perfectly round table and going to play a game. The game is, in each turn, a player will put one coin anywhere on the table (not on the top of coin already placed on the table, but on the surface 1 min read Puzzle | Place numbers 1 to 9 in a Circle such that sum of every triplet in straight line is 15Place the numbers 1 to 9 in a circle, so that wherever there are three in a straight line they shall add up to 15. SOLUTION:The sum of first number and last number is ten ( 1 + 9 = 10 ).Similarly, the sum of second number and second last element is also ten ( 2 + 8 = 10 )In the same way ( 3 , 7 ) an 2 min read Shape based PuzzlesPuzzle 21 | (3 Ants and Triangle)There are 3 ants sitting on three corners of a triangle. All ants randomly pick a direction and start moving along edge of the triangle. What is the probability that any two ants collide? Hint: Every ant has two choices (pick either of two edges going through the corner on which ant is initially sit 1 min read Puzzle | 3 cuts to cut round cake into 8 equal piecesPuzzle: You have a birthday cake and have to cut it into 8 equal pieces by making 3 cuts only. How do you do it? Solution: The solution can be divided into 3 basic steps. But apart from this there are also other method of executing this task. Step 1: Cut the cake into quarters (4 pieces) using 2 of 1 min read Puzzle 25 | (Chessboard and dominos)There is an 8 by 8 chessboard in which two diagonally opposite corners have been cut off. You are given 31 dominos, and a single domino can cover exactly two squares. Can you use the 31 dominos to cover the entire board? Answer: No Explanation: At first, it seems that there were 8*8 = 64 squares the 1 min read Puzzle | Three SquaresGiven four sticks of length 'a' and four more sticks of length 'b'. The length of 'b' is exactly half of the length of 'a'. The task is to make three equal squares using the given 8 sticks. Solution: Below are the steps to make three equal squares from the given sticks: 1. Place the first stick of l 1 min read Puzzle | Maximum pieces that can be cut from a Circle using 6 straight linesPUZZLE:Given a Circle and Six Straight Lines. What is the maximum number of pieces that one can cut the circle using these six straight lines?SOLUTION:Using six lines, we can cut the circle into 22 pieces at maximum.Using one line, the circle can be divided into two parts.Two lines divide the circle 1 min read Puzzle | Splitting a Cake with a Missing Piece in two equal portionProblem Statement: There are three friends who ordered a rectangular cake. One of them was in a hurry so he cut a rectangular piece from the cake. The piece could be of any arbitrary size(less than the size of the cake) and rotation. Now the remaining two friends want to divide the remaining cake in 1 min read Puzzle 48 | Rectangular CardboardGiven, a rectangular cardboard with a rectangular piece removed(of any size and orientation) how one can cut the rectangular cardboard in two equal parts with one straight line cut. Solution: Using the fact: that “any line passing through the center of a rectangle divides the rectangle into two equa 1 min read Puzzle | Dividing a Square into N smaller squaresPuzzle: Find all values of N for which one can dissect a square into N smaller squares, and outline an algorithm for doing such a dissection. Solution: The basic point to observe is a square has 4 right-angles. So, to divide it into smaller squares each of its right-angle must fall into another squa 2 min read Rubik's CubeAlgorithm to solve Rubik's CubeA Rubik's Cube is an interesting puzzle invented by 'Erno Rubik' which has 43 quintillion possible configurations. But with the use of certain algorithms, it can be solved easily. There are many variations of the Rubix cube nowadays but the most basic one is the 3x3x3 Rubik's cube.A 3x3x3 Rubik's cu 4 min read Rubik's Cube Facts and QuestionsWhat is a Rubik's Cube?The Rubik’s Cube is a 3-D combination Puzzle that was invented in 1974 by Hungarian sculptor and professor of architecture ErnÅ‘ Rubik. Rubik’s Cube is a Puzzle with a six-coloured cube, whose faces each include nine squares, eight of which can be rotated separately. In this ar 5 min read Brain TeasersBrain TeasersWhat are Brain Teasers?Brain teasers are puzzles or problems that are designed to stimulate and challenge the brain. They often require creative thinking, problem-solving skills, and the ability to think outside the box. Brain teasers come in various forms, including riddles, puzzles, and logic game 5 min read Crossword PuzzleCrossword Puzzle Of The Week #1 (for DSA)In this issue of Crossword Puzzle of the week, we will dive into the topics of Data Structures and Algorithms (DSA). The solution to the crossword puzzle is provided at the end. Crossword Puzzle #1 - by GeeksforGeeksHINTS: Down: 1. A ______ is like a line waiting to purchase tickets, where the first 2 min read Crossword Puzzle Of The Week #2 (for Computer Science and Applications)In this issue of Crossword Puzzle of the week, we will dive into the topics of Computer Science and Applications. The solution to the crossword puzzle is provided at the end. Crossword Puzzle Of The Week #2 (for Computer Science and Applications) HINTS: ACROSS:1. The ........ number system consists 2 min read Crossword Puzzle Of The Week #3 (for Database and Queries)In this issue of Crossword Puzzle of the week, we will dive into the topics of Database and Queries. The solution to the crossword puzzle is provided at the end. Crossword Puzzle Of The Week #3 (for Databases and Queries)HINTS: DOWN: 1. _______ gives a logical structure of the database graphically?2 1 min read Crossword Puzzle Of The Week #4 (for Object Oriented Programming)In this issue of Crossword Puzzle of the week, we will dive into the topics of Object Oriented Programming. The solution to the crossword puzzle is provided at the end. Crossword Puzzle Of The Week #2 (for Object-Oriented Programming)HINTS: DOWN 1. The class members declared as _____ can be accessed 2 min read Crossword Puzzle Of The Week #5 (for Operating System)In this issue of Crossword Puzzle of the week, we will dive into the topics of Operating Systems. The solution to the crossword puzzle is provided at the end. Crossword Puzzle Of The Week #5 (for Concepts of Operating System)HINTS: DOWN 1. Part of the operating system which is responsible for file m 2 min read Top 100 Puzzles Asked In Interviews Puzzles are asked in Interviews to check our problem-solving skills. Here we are providing you with the top 100 puzzles that are asked in Interviews. The main aim of puzzles is entertainment. Puzzles can be of many types:- picture puzzles, logical puzzles, mathematical puzzles, etc. It is very helpf 4 min read Like