SOLUTION: To get a C you need an average between 70-80. Kims scores are 76, 60, and 87 on each 100 point test. What scores are possible for the fourth test so she will have a C.
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Question 190518: To get a C you need an average between 70-80. Kims scores are 76, 60, and 87 on each 100 point test. What scores are possible for the fourth test so she will have a C. Answer by jonvaliente(64) (Show Source):
You can put this solution on YOUR website! Let x=Kim's possible test score
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Average=SUM of test scores/no of tests
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Kims total test scores for 3 exams=76+60+87=223
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To get a C, we need an average>=70 and <=80
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Multiplying all the terms by 4, we get:
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Subtracting 223 from all terms we get:
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Therefore, Kim must get a score between 57 and 97 on her fourth test to get a C
