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?

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

James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally James would like the fishing rod to arrive in one piece!

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

Which tank will fill first?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Prove that twice of ten is the same as twice of eleven.

John is the son of Jacob.
So,
Jacob is the_____of John's father?