I don't get this: Walter had 3/5 yard of wrapping paper. He used 3/4 of it. How much wrapping paper did he use? I found the common denominator and I get a subtraction problem of 12/20 - 15/20, which is obviously wrong. The answer is, according to my summer school teacher, 9/20. ???

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well the common denominator is 20

So Walter had 12/20

3/4 or 75% of 12/20 is 9/20

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