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 doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

Count the number of triangles in the picture below:

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

Can you move 2 matchsticks to form four equal sized squares.

What has to be broken before you can use it?

What has one eye, but can’t see?

What goes up but never comes down?