SOLUTION: the average is a 90 86*89*?? / 3 is 90 BUT WHAT?

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Question 852575: the average is a 90
86*89*?? / 3 is 90
BUT WHAT?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(86+89+x)/3 =90
(86+89+x) =270
175+x=270
x=95