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

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

What always comes into a house through the keyhole?

If two's company, and three's a crowd, then whats four and five ?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

What kind of storm is always in a rush?

81 x 9 = 801. What must you do to make the this equation true?

Bay of Bengal is in which state?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

10+10 and 11+11 can give you the same answer.

Explain how?