write two numbers so that the numbers are in order.; 6,010; ; 5,060

I'm not sure if that's what you mean, but the difference between 6010 and 5060 is 950, so to find a number in a halfway between them I divided 950 by 2 (which is 475) and added it to 5060 (or substracted from 6010 - it's the same). Next I added the same number (475) to 6010. So finally it would like like this:

6,485 ; 6,010 ; 5,535 ; 5,060

The correct answer is addition