What is the riddle which can be asked all day with a different correct answer each time.

Can you solve the below geography rebus by decoding the below rebus ?

Remove two matchsticks to make the below equation correct.

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

What is the word or phrase?

Which number should replace the question mark?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Why do we preferably have round manhole covers and not square ones?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?