A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

What has hands, but can’t clap?

How many triangles are there on the puzzle below?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

What type of tree can I carry in my hand?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

If 21x = 79x, what is the value of x?

How many letters are in the alphabet?

Solve below popular number sequence
314 159 265 358 979 323 846 ?