SOLUTION: In an algebra class a student has scores of 65, 72, and 84 on three exams. What score on the fourth exam is needed to make an average of at least 80%?
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Question 653909: In an algebra class a student has scores of 65, 72, and 84 on three exams. What score on the fourth exam is needed to make an average of at least 80%?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
(65+72+84+x)/4 >= 80
65+72+84+x >= 80*4
65+72+84+x >= 320
221+x >= 320
x >= 320-221
x >= 99
So you need at least a 99% on the fourth exam to make an average of 80% or better.
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