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5 November, 10:56

Chuanxi planned a rectangular sidewalk with a length of 21 ft. He made a scale drawing using a scale factor of 1 in. = 7 ft. He decided to change the length of the actual sidewalk to 27 ft. If the scale drawing still has a length of 3 in., what does 1 in. represent in the new scale?

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  1. 5 November, 11:16
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    Original Ratio of 1 in = 7 ft so 3 in = 21 ft

    Now, New ratio 1 in = x ft so 3 in = 27ft

    1/x = 3/27

    cross multiply a/b = c/d ad = bc

    1/x = 3/27

    3x = 27

    x = 9

    1 in represents 9 ft
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