The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What Adam and Eve do not have but the rest of the people have?

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?

What does below Rebus say?

XLR8

10+10 and 11+11 can give you the same answer.

Explain how?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

What is the fastest way to double your money?

How many times in a given day, minutes and hour clock comes in a straight line ?