Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What you cannot hold but it is yours?

I have Rs.50 and I spend it in the way as below.

What makes this number unique: 8,549,176,320?

Can you start the fire using two pieces of wood?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

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

What Time Should the last watch show in the below figure?

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.