100 x (total score so far + score on final) / (total possible so far + 100) = 59.5

Solve for "score on final" and plug in numbers for "total score so far" and "total possible so far."


This will be on next week's quiz...

Also, this kind of thing is usually pointless anyway --- just study and do well on the test, and don't worry about the worst you can do and still pass.