There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

How many words can a pen with half refill write?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

Can you place three balls such that the equation shown in the picture holds true?