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

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Can you make four (4) nines (9) equal 100?

What does the below image rebus riddle means ?

What has to be broken before you can use it?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

What begins with T, ends with T, and has T in it?

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

Which tank will fill first?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?