SOLUTION: To get a B in math, Mary must average 80 on all tests. Suppose Mary has scored 60,72,98, and 85 on the first four test. What score does she need on the fifth test to receive a B.

Question 401647: To get a B in math, Mary must average 80 on all tests. Suppose Mary has scored 60,72,98, and 85 on the first four test. What score does she need on the fifth test to receive a B.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
To get a B in math, Mary must average 80 on all tests. Suppose Mary has scored 60,72,98, and 85 on the first four test. What score does she need on the fifth test to receive a B.
.
Let x = score on fifth exam
then
(60+72+98+85+x)/5 = 80
(315+x)/5 = 80
315+x = 400
x = 85
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