[RM2K] HELP WITH VARIABLES REDUX

A while ago I requested help with variables for a game I am working on. and while my problem was sort of solved, I'm ashamed to admit when it comes to maths and numbers I am really REALLY stupid. Is it possible for the solution to be explained to me in layman's terms?

EDIT:Nevermind, I've managed to sort out the problem. It was simpler than I thought it was. Sorry everyone.