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

Why did Navjot Singh Sidhu put the new January calendar in the freezer

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

How can one talk without saying a single word?

What is the fastest way to double your money?