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17 October, 23:23

A tire shop had to fill 2 1 ⁄2 tires with air. It took a small air compressor 2 1 ⁄2 seconds to fill them up. How long would it take to fill 8 tires?

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  1. 18 October, 00:58
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    Let 2_1/2 = 5/2.

    Let t = time to fill 8 tires

    (5/2) / 8 = (5/2) / t

    8 (5/2) = (5/2) t

    20 = (5/2) t

    20 : 5/2 = t

    20 • 2/5 = t

    8 seconds = t

    Done.
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