SOLUTION: Sam's score for the first two exams was 88 and 64. What score does he need to get on the third exam if he wants to increase his average by 4 points?

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Question 348219: Sam's score for the first two exams was 88 and 64. What score does he need to get on the third exam if he wants to increase his average by 4 points?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = the score he must get on the third exam

(88 + 64 + x)/3 = x + 4

152 + x = 3(x + 4)

152 + x = 3x + 12

152 - 12 = 3x - x

140 = 2x

140/2 = x

70 = x

He must score 70 to raise his average by 4 points.

His average is x + 4 or 70 + 4 = 74.

The final answer is 70 on the third exam.