If it took eight men ten hours to build a wall, how long would it take four men to build it?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Identify the hidden meaning behind this picture?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

If,

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

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

D + F = ?

What you cannot hold but it is yours?