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.

81 x 9 = 801. What must you do to make the this equation true?

What does the below mathematical rebus mean?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

My location can be determined by the below rebus.
So where am i ?

Find the missing number in the image below.

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

Who is He ?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

A father's child, a mother's child, yet no one's son.

Who am I?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?