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.

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

What Adam and Eve do not have but the rest of the people have?

Find the next number in the series below

21 32 54 87 131 ?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

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

Can you write down eight eights so that they add up to one thousand?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?