Replace the question mark with the correct number.

what does this picture(rebus) riddle 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?

Why is 6 afraid of 7?

Count the number of balls in picture below:

There is a place where if I stand up straight, I will still be considered sideways.

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you decipher the below rebus?

PBLUESAISNUERSES