SOLUTION: A student scored 67, 81, and 98 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 760405: A student scored 67, 81, and 98 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 josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = the grade she needs
+%28+67+%2B+81+%2B+98+%2B+x+%29+%2F+4+=+85+
+%28+246+%2B+x+%29+%2F+4+=+85+
+246+%2B+x+=+4%2A85+
+x+=+340+-+246+
+x+=+94+
He must score 94 in order to average 85