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

Count the number of balls in picture below:

When it is alive we sing, when it is dead we clap our hands. What is it?

A farmer went to a market and bought a wolf, a goat, and a cabbage. On his way home, the farmer came to the bank of a river and rented a boat. But crossing the river by boat, the farmer could carry only himself and a single one of his purchases: the wolf, the goat, or the cabbage. If left unattended together, the wolf would eat the goat, or the goat would eat the cabbage. The farmer’s challenge was to carry himself and his purchases to the far bank of the river, leaving each purchase intact. How did he do it?

Can you find a five letter word that is left with only two letters if one is removed?

In the Wild West, you are challenged into a death match by two bounty hunters nicknamed Golden Revolver (GR) and Killer Boots (KB). You accept the challenge. None of you want to waste any of the bullet and so a certain rules are laid down:

1) All of you will shoot in a given order till the last man standing.
2) Each of you shoots only once upon his turn.
3) If any one of you is injured, the other two will finish him off with an iron rod.
4) The worst shooter of all (which is you) shoots first and the best one shoots at the last.

Now, how will you plan things if you know that you hit every third shot of yours, KB hits every second shot and GR hits every shot ?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What can you catch but never throw?

Find the value of "?" in the ball picture Riddle below: