SOLUTION: a student scored 71,83, & 96 on three algebra tests. What must he score on the 4th test in order to have an average grade of at least 85?

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Question 285581: a student scored 71,83, & 96 on three algebra tests. What must he score on the 4th test in order to have an average grade of at least 85?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = grade on 4th test
%2871+%2B+83+%2B+96+%2B+x%29%2F4+=+85
%28250+%2B+x%29%2F4+=+85
250+%2B+x+=+4%2A85
250+%2B+x+=+340
x+=+90
He must score 90