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

Take one out and scratch my head, I am now black but once was red. What am I?

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?

People put me on the table and cut me but do not eat me. What am I?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

You need to move three matchsticks to form three squares. Can you do it?

What came first, the chicken or the egg?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

When can we add 2 to 11 and get 1 as the correct answer?