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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?
Wiki User
∙ 13y ago
(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%.
Wiki User
∙ 13y ago
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