SOLUTION: Marcus wants to end the semester with at least an 85 test average in his math class. On his first 3 tests, he earned 83, 97, and 80. What will he have to earn on his fourth test to

Question 1003185: Marcus wants to end the semester with at least an 85 test average in his math class. On his first 3 tests, he earned 83, 97, and 80. What will he have to earn on his fourth test to have at least an 85 average? Let g represent the grade needed on his fourth test.
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Provided that each test is of equal weight, you would write
(83+97+80+g)/4 >= 85
Now solve for g...multiply by four
83+97+80+g >= 340
and subtract off the three scores and get
g >= 80
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