SOLUTION: Doug received the following scores on his first four tests: 77%, 83%, 89%, and 86%. What score must he get on his fifth test to average 85% for all five tests?

SOLUTION: Doug received the following scores on his first four tests: 77%, 83%, 89%, and 86%. What score must he get on his fifth test to average 85% for all five tests?

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Question 333196: Doug received the following scores on his first four tests: 77%, 83%, 89%, and 86%. What score must he get on his fifth test to average 85% for all five tests?
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
(77+83+89+86+x)/5=85
335+x=85*5
335+x=425
x=90%
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