Brianna went on a trip to the art museum and sketched a scale drawing of a rectangular wall mural. She used a scale factor of 0.2. The sketch was 12 inches wide and 18 inches long. What was the length of the mural?

A scale factor of 0.2 means each sketch dimension is 0.2 times the corresponding mural dimension. The sketch is 18 inches long, so the mural’s length is 18 ÷ 0.2 = 90 inches. Therefore, the mural was 90 inches long.

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