SOLUTION: Mark's average (arithmetic mean) on four tests is 75. What grade does he need on his fifth test to raise his average to an 80?

Question 309319: Mark's average (arithmetic mean) on four tests is 75. What grade does he need on his fifth test to raise his average to an 80?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Mark's average (arithmetic mean) on four tests is 75. What grade does he need on his fifth test to raise his average to an 80?
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Let "x" be the score on the 5th test.
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solve: (4*75+x)/5 = 80
300+x = 400
x = 100 (score needed on the final test)
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Cheers,
Stan H.
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