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John bought 9 CDs. Some of them cost $12.75, and the rest cost $11.95. The total was $112.35. How many did he buy at each price?

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a + b = 9 ... 11.95 a + 11.95 b = 107.55

12.75 a + 11.95 b = 112.35

subtracting equations (to eliminate b) ... .80 a = 4.80

solve for a , then substitute back to find b

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