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

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

What is the centre of gravity?

Why do people go to bed?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What can you catch but never throw?

Can you count the number of squares in the figure below?

Imagine you are in a room with no windows or doors. How will you get out?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?