Yes, Bryan, it's impossible to have anything left over to mark "pass".
But, if the formula is written to mark "pass" regardless of what the
total is, you couldn't have a "good" grade because there wouldn't be
any possiblity of anything escaping "pass" that could be "good".

I don't think the actual problem was presented to us, just the OP's
condensation of many possible variations. Instead of anwering them all,
I just picked the litteral one and maybe he'd tell us what the actual
problem was. ed