99
There are many of them such as 173 and 187, but half way between them is the number 180.
The number 1 is found 300 times between 1 and 1000.
5 times
There is no such number because they are infinitely dense. Between any two numbers, there are infinitely many numbers. And between any two of them there are infinitely many.
The word "quotient" comes from the Latin quotiens which means "how many times" and indicates how many times a number goes into another.
I count 53 times.
5 times, simple maths
20
20
20
55
19.