What does does this rebus picture means ?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Which letter of the alphabet has the most water?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

Can you decipher the two rows to find the hidden word?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

When 99 is considered higher than 100?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=