Replace the question mark with the correct number below.

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

What number when divided in half becomes zero?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

You need to arrange three 7 and mathematical symbols to form number 1?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?