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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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. ???

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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yes its 9/20ths because you have to take 3/4 of 3/5ths. 3/5ths is .6. take .6 multiply by 3/4 and you get .45 which is 9/20ths.
\[\frac{ 3 }{ 5 }\times \frac{ 3 }{ 4 }=\frac{ 9 }{ 20 }\]

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