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.

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

What English word has three consecutive double letters?

Remove two matchsticks to make the below equation correct.

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?