What always comes into a house through the keyhole?

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.

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

Can you find out the missing number in the grid?

What English word has three consecutive double letters?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Can you fill the blank with the correct number?

6 30 870 756030 _____