SOLUTION: A student earned scores of 83,78, and 77 on three of four tests. What must the student score on the fourth test to have an average of exactly 80?

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Question 825242: A student earned scores of 83,78, and 77 on three of four tests. What must the student score on the fourth test to have an average of exactly 80?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(83+78+77+x)/4=80
238+x=80*4
x=320-238
x=82