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

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

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

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

12345 a famous South Indian actor
567 is a path in jumbled form
8 & 10 are same letters
9 is one among the first six alphabets.
WHO AM I?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

During which month do people sleep the least?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?