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

Find the last number in the series below:

voN luJ yaM raM ---

0 0 0 = 6
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

Why 1729 is a magic number? Answer Logically.

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What is the riddle which can be asked all day with a different correct answer each time.

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Can you identify the hidden rebus in the image below?