word problem, please

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Joe has scored 84, 89, and 90 on his first three exams in his math class. If the standard 70,80,90 scale is used for grades and the exams are equally weighted, what must he score on the final exam, f, in order to

a) Get a C average on exams?
f


b) Get a B average on exams?
f



c) Get an A average on exams?
f

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