What brings you down but never up?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

Buy me, smell me or deliver me, I do not change.

Who am I?

In a town, there are over 100 flats.
Flat-1 is named first flat.
Flat-2 is named second flat.
Flat-3 is named third flat.

A visitors 'Victor' decides to walk through all the flats, he finds all the flats except flat-62.
Victor later founds that the local of the town have given it another name.

What is the name of the Flat?

If an electric train is travelling south, then which way is the smoke going?

What is the relationship between these matchstick pictures below?

John decided to give his bike 3 coats of paint. Which coat would go on the first?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?