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.

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
.
Average=SUM of test scores/no of tests
.
Kims total test scores for 3 exams=76+60+87=223
.
To get a C, we need an average>=70 and <=80
.

.
Multiplying all the terms by 4, we get:
.

.
Subtracting 223 from all terms we get:
.

.
Therefore, Kim must get a score between 57 and 97 on her fourth test to get a C
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