I'm guessing you got those from jacvapour too, their pg liquid I think is 80% pg 20% vg although I don't know for sure. The pg liquid I got from them is definitely the most pg heavy liquid I've had, it might even be 100% pg. Shoot off an email to them and ask them the ratios then people here might be able to advise you on how you could mix them.
Shop around and you'll find a lot of different pg/vg level liquids already mixed
EDIT: Just had a look at their site, both their pg and vg mixes are 80/20