I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

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.

Find the last number in the series below:

voN luJ yaM raM ---

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Decode the movie name from the below picture?

Can you replace the question mark with the correct number?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

How can a man go eight days without sleep?