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.

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

In a guessing game, five friends had to guess the exact numbers of apples in a covered basket.
Friends guessed 22, 24, 29, 33, and 38, but none of the guesses was correct. The guesses were off by 1, 8, 6, 3, and 8 (in random order).

Can you determine the number of apples in a basket from this information?

Can you count the number of triangles inside a triangle?

What is both possible and impossible at the same time?

Who has married many women but was never married?

Why is the Hole below a Lock?

Can you find out which options fits best with the missing column?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

What number when divided in half becomes zero?