A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

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

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

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.

Can you place six X (crosses) in below board without making three in a row in any way ?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?