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

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?

The more it dries, the wetter it becomes. Can you tell what it is?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

What is always in front of you but can’t be seen?

Find the last number in the series below:

voN luJ yaM raM ---

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?