15
3
31 - 16 = 15
39
18
7.5
15
3
35
31 - 16 = 15
There cannot be any number between two identical numbers.
39
This is only a convention.
It depends on the number it is distancing like for example, 9 or 15.
The Thin Line Between was created on 2008-07-15.
The whole number between 13 and 17 is 15
Add the two numbers together and then divide by two. Assume the two number is 10 and 20. Add them together (30) and divide by 2 (15).