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

Why are all black people so quick ?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What will you call your mother's brother's brother-in-law?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?

what does the below math rebus puzzle mean?

Identify the hidden meaning behind this picture?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?