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27 January, 16:51

A construction crew builds 2 floors of a skyscraper every 10 days. How log will it take for the crew to build 15 floors on the skyscraper

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  1. 27 January, 17:17
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    2 floors are built every 10 days.

    1 floor can be built in 10/2 days.

    15 floors can be built in (10/2) * 15 = 5 * 15 = 75 days.
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