If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

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

Who has married many women but was never married?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

Next Number in the Series,

5, 16, 49, 104, ?

There was a blind beggar living on the footpath of a street. Suddenly one day, the beggar's brother died. What was the relation of the blind beggar with the person who died?

PS: Brother is not the answer.