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

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

John was piloting a plane behind a car but was never able to overtake it. Why?

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

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

How many times can you subtract the number 5 from 25?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.