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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ButterRobot · 51-55, M

(75+91+x)/3=82

SW-User

@ButterRobot Correct formula, except that the answer is 80.

ButterRobot · 51-55, M

if you solve for x, then x=80.

SW-User

Rob04 · 18-21, M

@ButterRobot Thanks! Thought I was clever in my class but haven't come across this yet. It Algebra I know. Need t remember formula.