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

What is next number in the pattern below:

131 517 192 123 ?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

who is silent in the parliament?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Count the number of triangles in the below picture?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.