Brain Teasers & Puzzles
-
You have two jars, 50 red marbles and 50 blue marbles. You need to place all the marbles into the jars such that when you blindly pick one marble out of one jar, you maximize the chances that it will be red. When picking, you’ll first randomly pick a jar, and then randomly pick a marble out of that jar. You can arrange the marbles however you like, but each marble must be in a jar.
View SolutionSubmit Solution- 1,829.0K views
- 1 answers
- 0 votes
-
Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?
View SolutionSubmit Solution- 1,830.3K views
- 1 answers
- 0 votes
-
Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?
View SolutionSubmit Solution- 1,830.1K views
- 2 answers
- 0 votes
-
100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say “Every prisoner has been in the special room at least once”. If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?
View SolutionSubmit Solution- 1,830.3K views
- 1 answers
- 0 votes
-
A certain town comprises of 100 married couples. Everyone in the town lives by the following rule: If a husband cheats on his wife, the husband is executed as soon as his wife finds out about him. All the women in the town only gossip about the husbands of other women. No woman ever tells another woman if her husband is cheating on her. So every woman in the town knows about all the cheating husbands in the town except her own. It can also be assumed that a husband remains silent about his infidelity. One day, the mayor of the town announces to the whole town that there is at least 1 cheating husband in the town. What do you think happens?
View SolutionSubmit Solution- 1,838.0K views
- 1 answers
- 2 votes
-
When can you add 2 to 11 to get 1 as the correct answer?
Hint: many possible
View SolutionSubmit Solution- 1,831.6K views
- 3 answers
- 1 votes
-
A bridge will collapse in 17 minutes.
4 people want to cross it before it will collapse. It is a dark night and there is only one torch between them.
Only two people can cross at a time.
“A” takes a minute to cross.
“B” takes 2 minutes.
“C” takes 5
and “D” takes 10 minutesHow do they all cross before the bridge collapses?
View SolutionSubmit Solution- 1,854.0K views
- 2 answers
- 2 votes
-
Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates.
May 15 16 19
June 17 18
July 14 16
August 14 15 17
Cheryl then tells Albert and Bernard separately the month and the day of her birthday, respectively.
Albert: I don’t know when Cheryl’s birthday is, but I know that Bernard does not know, too.
Bernard: At first, I didn’t know when Cheryl’s birthday is, but I know now.
Albert: Then I also know when Cheryl’s birthday is.
When is Cheryl’s birthday?
View SolutionSubmit Solution- 1,830.3K views
- 1 answers
- 0 votes
-
The owner of a banana plantation has a camel. He wants to transport his 3000 bananas to the market, which is located after the desert. The distance between his banana plantation and the market is about 1000 kilometer. So he decided to take his camel to carry the bananas. The camel can carry at the maximum of 1000 bananas at a time, and it eats one banana for every kilometer it travels.
What is the most bananas you can bring over to your destination?
View SolutionSubmit Solution- 1,839.8K views
- 1 answers
- 0 votes
-
You have 100 doors in a row that are all initially closed. you make 100 passes by the doors starting with the first door every time. the first time through you visit every door and toggle the door (if the door is closed, you open it, if its open, you close it). the second time you only visit every 2nd door (door #2, #4, #6). the third time, every 3rd door (door #3, #6, #9), ec, until you only visit the 100th door.
What state are the doors in after the last pass? Which are open which are closed?
Puzzle asked in: Google,Adobe,Amazon,Oracle
View SolutionSubmit Solution- 1,839.9K views
- 2 answers
- 0 votes
More puzzles to try-
Flight Crew brain teaser
In a certain flight crew, the positions of Pilot, Copilot, and Flight engineer are held by 3 persons Mario,Dan, Charli, ...Read More »Magical Maths
Replace the (?) with the correct mathematical signs to make the expression equal to 59. 18 ? 12 ? 4 ...Read More »Girl’s name Puzzle
One girl was going to the college, one boy asked her name She replied: “20year6month” Can you guess her name ...Read More »Simple or complex
It may be simple, it may be complex; it may have a name, but no gender or sex; it is ...Read More »Number Riddle
Please add the following numbers in your head. Start with 1000. Add 40 Add 1000 Add 30 Add 1000 Add ...Read More »Catch the liar
There are two beautiful yet remote islands in the south pacific. The Islanders born on one island always tell the ...Read More »How will they split the loot?
Five pirates stole a treasure – exactly hundred gold coins. Pirates have a special way of dividing their loot: The ...Read More »I stop it runs riddle
I run, it runs, I stop, it runs. What it it?Read More »Fly travel riddle
Two cyclists began a run, one starting from Delhi and the other starting from Agra. When the riders were 180 ...Read More »Cotton or Gold
Which would you say is heavier, a pound of cotton or a pound of gold?Read More »What is the cost of bat and ball?
Cricket bat and ball cost $50. If the bat cost $49 more than the ball, what is the cost of ...Read More »Bottom at the top
What has a bottom at the top?Read More »25 seat bar riddle
There is a bar with 25 seats in a line. The people there are anti-social so when they walk in ...Read More »You can’t find out!!!
Fariha, Ononno, Richie each got a prime. Suppose the numbers are A,B,C. They permute the numbers in the following possible ...Read More »Spider in IT
Why did the spider get a job in IT?Read More »Would you believe that the colors of squares A and B are the same?
Would you believe that the colors of squares A and B are the same? They are!Use your fingers or a ...Read More »Fastest Animal Riddle
I am the fastest animal but cannot climb the tree. What am I?Read More »Number of people in the bus puzzle
An empty bus pulls up to a stop and 10 people get on, 8 took ticket and rest 2 shown ...Read More »Alphabet Puzzle
You can only use any letter once, what are the largest and smallest numbers that you could write down in ...Read More »Girl with ribbon puzzle
A girl found that she had a 56 cms strip of ribbon. She could cut a cm off every second. ...Read More »
