A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Can you write down eight eights so that they add up to one thousand?

How do you go from 98 to 720 using just one letter?

What seven-letter word has hundreds of letters in it?

I have no life, but I can die. What am I?

I look at you, you look at me I raise my right, you raise your left. What am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

What's the best place to go shopping in the ocean?

In the picture given below, can you find out which digit will take place of the question mark?

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?