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

What is more useful when it is broken?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

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.

The more of this there is, the less you see. What is it?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

Which point will the car reach to go out?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?