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

How many times can you subtract the number two from the number fifty?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

The dirtier I get, the whiter I look. Who am I?

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

Which point will the car reach to go out?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.