SOLUTION: How do I set this equation up? Thanks! An average score of 90 or above in a history class receives an A grade. You have grades of 90, 85, 93 and 82 on four exams. Find the range

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Question 926226: How do I set this equation up? Thanks!
An average score of 90 or above in a history class receives an A grade. You have grades of 90, 85, 93 and 82 on four exams. Find the range of scores, on the fifth exam that will give you an A grade for the course.
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
(90 + 85 + 93 + 82 + x)/5 = 90
350 + x = 90*5
350 + x = 450
x = 100
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answer:
you must score 100 on the fifth exam to get an A in the course
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