What is full of holes but still holds water?

If,

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

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

D + F = ?

Solve the puzzle by telling what does below picture means.

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

What is so fragile that saying its name breaks it?

why number 8549176320 is one of a kind?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?