It belongs to you, but other people use it more than you do. What is it?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

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?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Which country gets ill every time?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

Can you find the mistake in the below statement?