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.

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What has hands, but can’t clap?

Why is the Hole below a Lock?

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

The Little ant seems to be always confused. Do you know why?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

What does this Rebus Picture mean?