Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What 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.

What jumps when it walks and sits when it stands?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

How many letters are in the alphabet?

There is something which you can be arrested for attempting but not for successfully completing.