Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

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?

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

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

Which number comes next in the number series?

2, 9, 30, 93, ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

81 x 9 = 801. What must you do to make the this equation true?

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

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

Give it food and it will live; give it water and it will die.

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?