Question 837257: A student averaged 86% on his first two exams. What must he earn on his 3rd exam to have an A average? (assume an A=90%-100%). Write an inequality representing this situation and solve it.
Answer by sheldonbbtrocks(115)   (Show Source):
You can put this solution on YOUR website! Well we could assume that this student got an 86% on all the exams, even though he probably not have, we need to add 3 numbers that average 86, and this is the easiest solution. Also, because he needs a 90% or better average on 4 exams, we must account for this by multiplying 90 by 4. This yields:
86+86+86+x<=360
Now solve:
258+x<=360
x<=102
So John must somehow earn [102%] on his next exam to get an A average.
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