You need to move three matchsticks to form three squares. Can you do it?

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?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What does this mathematical rebus means ?

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

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?