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06-02-2017
Mathematics

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Lynn has grades of 93, 75, and 86 on three math tests. What grade must she make on the next test to have an average of exactly 81 for the four tests?

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06-02-2017

(93+75+86+x)/4=81
93+75+86+x=324
The sum of the scores is 324. Now solve for x:
254+x=324
x=70

The answer is 70

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