A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Can you divide the below-given shape into four equal and identical pieces?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

What breaks yet never falls, and what falls yet never breaks?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

What has 88 keys?