I dunno about everyone else but I found that spreadsheets made math a lot more appealing. You can play around with shit, calculate useful information and most importantly, not even really have to do the actual math at all if you don't want to.
Assume all traffic is closely related and relevant, this exercise is just based on the numbers.
Oh, before I go, here's the spreadsheet I have open 24/7 for quick calculations. If you're not using something like this, take mine, or build your own. If you don't understand it at first, just look at the calculations I'm using. The colored cells are the only ones you need to change.