A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Replace the question mark in the picture below.

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

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

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

The more it dries, the wetter it becomes. Can you tell what it is?

When it is alive we sing, when it is dead we clap our hands. What is it?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

What number divided by 4 is the same as that number minus 4?