SOLUTION: james scored 85, 89, 76, and 83 on the first 4 tests of the semester. What must his score be on the next test to have an 85 test average?

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Question 515306: james scored 85, 89, 76, and 83 on the first 4 tests of the semester. What must his score be on the next test to have an 85 test average?

Answer by Maths68(1474) About Me  (Show Source):
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james scored 85, 89, 76, and 83 on the first 4 tests of the semester. What must his score be on the next test to have an 85 test average?

(85+89+76+83+x)/5=85
(333+x)/5=85
333+x=5*85
333+x=425
x=425-333
x=92
He must score 92 in the 5th test to maintain an average of 85.