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average = the sum of the test scores/the number of the tests

93.3 = (97 + 91 + the third test score)/3 (multiply by 3 to both sides)
279.9 = 97 + 91 + the third test score (subtract 97 and 91 to both sides)
91.9 = the third test score

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โˆ™ 2009-12-17 04:59:23
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Q: If one of your test grade was 97 percent and another 91 percent and your average is 93.3 percent what is the grade of the thrid test score?
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