SOLUTION: a student has test grades of75 and82. What must he get on a thrid test to have a average of80 or higher?

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Question 11186: a student has test grades of75 and82. What must he get on a thrid test to have a average of80 or higher?
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
let third exam score = x. So,

%2875%2B82%2Bx%29%2F3+=+80
75+82+x = 240
157+x = 240
x = 83

So, the student needs to get 83 or more.

jon.