Prove that twice of ten is the same as twice of eleven.

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

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Can you move 2 matchsticks to form four equal sized squares.

If eleven plus two equals one, what does nine plus five equal?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

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

Find the smallest sentence with all the English alphabet.

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

How many Watermelons are there in the below picture?