Question 755410: your test average is a 78 after 5 tests. What must you score on the 6th test to bring your average up to an 80? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! your test average is a 78 after 5 tests. What must you score on the 6th test to bring your average up to an 80?
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Equation:
(5*78+x)/6 = 80
390 + x = 480
x = 90
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Cheers,
Stan H.
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