SOLUTION: James scored 77, 81, 70, and 76 on four tests. What must he score on the next test to have an 80 average in the course?

SOLUTION: James scored 77, 81, 70, and 76 on four tests. What must he score on the next test to have an 80 average in the course?

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Question 1034849: James scored 77, 81, 70, and 76 on four tests. What must he score on the next test to have an 80 average in the course?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Call the fifth score, x. Then we write
(77+81+70+76+x)/5 = 80
304 + x = 400
x = 96
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