SOLUTION: Peter wants his math average to be above 85 for the year. If his average is for the first three quarters are 80,78, and 92, what must he score for the fourth quarter to achieve his

Question 81183: Peter wants his math average to be above 85 for the year. If his average is for the first three quarters are 80,78, and 92, what must he score for the fourth quarter to achieve his goal?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Peter wants his math average to be above 85 for the year. If his average is for the first three quarters are 80,78, and 92, what must he score for the fourth quarter to achieve his goal?
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Let "x" be his fourth quarter score.
EQUATION:
[80+78+92+x]/4 > 85
(250+x)>340
x>90
His 4th quarter score must be greater than 90.
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Cheers,
Stan H.
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