How many times can you subtract the number two from the number fifty?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

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

Before Mount Everest was discovered, what was the highest mountain in the world?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

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.

I have an eye but still cannot see.

Who am I?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?