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.

How is the moon similar to a dollar?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

What happened when the wheel was invented?

Decode below rebus
D
N
A
T
S , D

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

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

How is this possible?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?