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.

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What is full of holes but still holds water?

Why is the Hole below a Lock?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?