How do you work this out?

Ben had a mean mark of 82% for three exams.

If he scored 75% and 91% for two of the exams, what was his mark on the third exam?

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room101 · 51-55, M

3x82=246

246-(75+91)=80

the answer is 80%

MartinTheFirst · 26-30, M

@room101 that's a good way to do it