A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Find the next number in the series below

21 32 54 87 131 ?

If two's company, and three's a crowd, then whats four and five ?

How many triangles can you count in the figure given?

What does this mean?

CCCCCCC

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Imagine you are in a room with no windows or doors. How will you get out?

If,

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

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

D + F = ?

Why did the Girl throw the butter out of the window?