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) (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.
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