SOLUTION: a student receives scores of 78,85,and 69 on the first 3 of 5 tests. What must the student average on the next 2 tests to achieve a total average of exactly 80?

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Question 670337: a student receives scores of 78,85,and 69 on the first 3 of 5 tests. What must the student average on the next 2 tests to achieve a total average of exactly 80?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(78+85+69+2x)/5=80
2x+232=80*5
2x+232=400
2x=400-232
2x=168
x=168/2
x=84