What levels do i add str on 1:8 str:int hybrid

just as the title says

You add 8x int, then 1x Str = 9 stat points.

1>110=109x3=327 Stat points.

327/9=36,33/3=12,11

So 12 levels into STR, leaves you with 3 statpoints, which you'd have to put in int if you want to continue the build..