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In a country in which people only want boys, every family continues to have children until they have a boy. if they have a girl, they have another child. if they have a boy, they stop. what is the proportion of boys to girls in the country? 

Assuming both having a boy or a girl are equal in probability then the ratio is 1.  Read more »

If you look at a clock and the time is 3:15, what is the angle between the hour and the minute hands? ( The answer to this is not zero!) 

The time is 3:15, i.e. 25% of the time between 3 and 4 has passed. The hour-hand should, by simple mechanical logic, have moved 25% of its total distance between... Read more »

How many times a day a clock’s hands overlap? 

In any circular motion, if the ratio between 2 fellow is n:1 then for each lap of the slower fellow, faster fellow overlaps him n times, except for the last lap... Read more »

Mike has $20 more than Todd. How much does each have given that combined they have $21 between them. You can’t use fractions in the answer. (Hint: This is a trick question, pay close attention to the condition) 

Mike has $20, Todd initially has $21. Todd keeps all his money on the table between them. Hence, now Todd has nothing, Mike has $20 more than Todd, and they have... Read more »

How many piano tuners are there in the entire world? 

This question takes some basic knowledge about the population of the united states and the world…not really about piano tuners.First think about how many pianos... Read more »

How do you cut a rectangular cake into two equal pieces when someone has already taken a rectangular piece from it? The removed piece an be any size or at any place in the cake. You are only allowed one straight cut. 

Slice the cake half-way through the depth of the cake (look through the side of the cake). This way no matter what size the slice removed is or where it is removed,... Read more »

You have eight balls all of the same size. 7 of them weigh the same, and one of them weighs slightly more. How can you fine the ball that is heavier by using a balance and only two weighings? 

Choose 6 balls and weigh 3 against 3 - if they weigh the same, you have another weighing for the remaining 2 balls and you can find the heavier one - if they don’t... Read more »

Every man in a village of 100 married couples has cheated on his wife. Every wife in the village instantly knows when a man other than her husband has cheated, but does not know when her own husband has. The village has a law that does not allow for adultery. Any wife who can prove that her husband is unfaithful must kill him that very day. The women of the village would never disobey this law. One day the queen of the village visits, and announces that at least one husband has been unfaithful. What happens? 

Nothing happens. The queen does not tell the wives anything they don’t already know. They know that the other husbands are cheating, so it is not news to them.  Read more »

What method would you use to look up a word in a dictionary? 

Do you remember that game 20 questions? You have to ask 20 questions to guess a word. The way to cheat is to narrow it down by half every time. The English dictionary... Read more »

Imagine you have a closet full of shirts. It’s very hard to find a shirt. So what can you 

Hash it. Take every shirt, and put it in a different drawer depending on the color of the shirt. Whenever you want a shirt, all you have to do is simply open the... Read more »

What gives you joy? 

Concatinating the letters ‘j’, ‘o’, and ‘y’, will give you the word joy  Read more »

Imagine you have a closet full of shirts. It’s very hard to find a shirt. So what can you do to organize your shirts for easy retrieval? 

Hash it. Take every shirt, and put it in a different drawer depending on the color of the shirt. Whenever you want a shirt, all you have to do is simply open the... Read more »

You have to get from point A to point B. You don’t know if you can get there. What would you do? 

The two most common ways to tackle a problem like this are using Depth-First Search (DFS), and Breadth-First Search (BFS). In the example above, you drive and drive... Read more »