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How do you work out this numeracy question?

Ben had a mean 82% for three exams.

If he scored 75% and 91% for two of the exams, what was his mark on the third exam?
summerlove
31-35, F
4 replies 12 views May 3, 2018
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SW-User
Then why ask if you knew the answer
+ 1 · Reply · Translate · May 3, 2018
summerlove · 31-35, F
@SW-User I knew the answer because they're online practice quizzes and I got the answer wrong. I don't know how they got that answer though.
+ 1 · Reply · Translate · May 3, 2018
SW-User
78?
+ 0 · Reply · Translate · May 3, 2018
summerlove · 31-35, F
@SW-User The answer is 80%.
+ 1 · Reply · Translate · May 3, 2018
 
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