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27 July, 08:42

A drawing of a surfboard in a catalog shows its length as 8 4/9 inches. Find the actual length of the surfboard if 1/2 inch length on the drawing corresponds to 3/8 foot of actual length.

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  1. 27 July, 08:58
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    3/8 of a foot = 3/8 x 12/1 or 4 1/2 inches

    So our 1/2 inch grows by a factor of 9 because 4 1/2 : 1/2 = 9 Think how many 1/2 dollars are in 4 1/2 dollars. (Answer is 9)

    So our 8 4/9 in the catalog has to grow the same

    8 4/9 x 9 = 8 4/9 x 9/1 = 76/9 x 9/1 or 76 inches which is 6 ft 4 inches.

    (76 : 12 = 6 r4)
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