SOLUTION: A student scored 67, 76, and 99 on three algebra tests. What must he score on the fourth test in order to have an average grade of at least 85?

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Question 860814: A student scored 67, 76, and 99 on three algebra tests. What must he score on the fourth test in order to have an average grade of at least 85?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Let x represent grade on 4th test    

%2867+%2B+78+%2B+99+%2B+x%29%2F4+%3E=+85

                x  ≥   340 - (67 + 78 + 99)