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

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

Can you replace the question mark with the correct number?

The cream is heavier than Milk. True or False?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?