A scale drawing is made to enlarge a picture by using a scale factor of 3. The enlarged picture is 9 inches by 15 inches. What are the dimensions of the original picture?

A scale factor of 3 means each dimension of the enlarged picture is 3 times the original. Divide both enlarged dimensions by 3: 9 ÷ 3 = 3 inches and 15 ÷ 3 = 5 inches. The original picture is 3 inches by 5 inches, choice A.

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