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

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

John was drowned by he was not wet. How?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What does Alexander the Great and Winnie the Pooh have in common?