SOLUTION: John received three grades of 85, 92, and 100 on his first three tests. What must he get on his fourth test to get a 90 average?

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Question 894526: John received three grades of 85, 92, and 100 on his first three tests. What must he get on his fourth test to get a 90 average?
Answer by Alan3354(69443) About Me  (Show Source):
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John received three grades of 85, 92, and 100 on his first three tests. What must he get on his fourth test to get a 90 average?
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He has 85+92+100 = 277 "points"
4*90 = 360
360 - 277 = 83