I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

The dirtier I get, the whiter I look. Who 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's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

People make me, save me, change me, raise me. What am I?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

If two's company, and three's a crowd, then whats four and five ?

You need to arrange three 7 and mathematical symbols to form number 1?

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?