SOLUTION: Stephanie has 85,92,and 71 on her tests. what score must she earn to have an average of 80 or above?

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Question 410251: Stephanie has 85,92,and 71 on her tests. what score must she earn to have an average of 80 or above?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(85+92+71+x)/4=80
248+x=320
x => 72