Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

A journalist was investigating a sacred cult in the jungles of Africa when he was caught by one of the person. He was confined in a cave till the leader arrived. The leader told him that he need to tell him a statement. If he thinks the statement is true, then the journalist head will be chopped off. If he thinks that the statement is false, his head will be smashed with a hammer.

What statement did the journalist make to survive?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

If eleven plus two equals one, what does nine plus five equal?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Why do you find that most of the buildings are deprived of the 13th floor?