Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Who has married many women but was never married?

Can you spot the man between the coffee bean in the picture below ?

No matter how little or how much you use me, you change me every month. What am I?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

What is red and smells like blue paint?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

Prove that twice of ten is the same as twice of eleven.