An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Find out the number of circles in the given picture having Illusion

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

What number do you get when you multiply all of the numbers on a telephone's number pad?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

What is the next number in the series?

15 29 56 108 208 ?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What kind of band never plays music?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?