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?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

How is a fly different from a mosquito?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

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

10+10 and 11+11 can give you the same answer.

Explain how?

What goes up but never comes down?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?