How to calculate passing marks

If you mean in a test quiz the formula is this:
correct answers ✖ 3 _ uncorrect answers divided by number of questions ✖ 3
if we suppose true answers with t
wrong with w
and all with a
we got:

Well in order to lose a pound you would have to burn 1,500 calories. the more calories you burn the more weight you lose. in order to lose 2 pounds you would have to run 4 hours and 28 minutes.