SOLUTION: If you received an 85, 89, and 92 on three tests, how many points do you need to score on your next test in order to have an average of at least 90?

Question 904757: If you received an 85, 89, and 92 on three tests, how many points do you need to score on your next test in order to have an average of at least 90?
Found 2 solutions by rfer, richwmiller:
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
(85+89+92+x)4=90
266+x=90*4
x=360-266
x=94
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
look at the scores and see how much you missed 90 or went over . Add that to 90 and that is what you need.
90-85=5 below
90-89=1 below
90-92-2 above
add them up and you get 4 below. add 4 to 90 and that is what you need. 94
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