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(77+83+89+86+x)/5=85

(335+x)/5=85

(335+x)=85*5

335+x=425

x=425-335

x=90

He must get 90% on his fifth test to average 85%.

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Q: What score must he get on his fifth test to average 85 percent for all five tests if his first four scores were 77 percent 83 percent 89 percent and 86 percent?
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