How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

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?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

I have no life, but I can die. What am I?

How many bananas can you eat if your stomach is empty?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?