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 will you call your mother's brother's brother-in-law?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

If 1+9+8=1, what is 2+8+9?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

who is silent in the parliament?

I can be cracked, made, told, and played. What am I?

What does this rebus means ?

How many letters are in the alphabet?

Which is heavier: a ton of bricks or a ton of feathers?