Replace the question mark with the correct number in below Picture:

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Why do Chinese men eat more rice than Japanese men do ?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

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

What can go up a chimney down, but can’t go down a chimney up?

If,

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

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

D + F = ?

What has one letter and starts with an E?