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28 August, 12:15

Two typers can type a book together in 4 days. How many days will it take each of them to type the book alone if the first one types twice as fast as the second one?

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  1. 28 August, 12:26
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    Therefore, the first finished the book alone for the 6 days.

    Therefore, the second finished the book alone, for the 12 days.

    Step-by-step explanation:

    We have that is the first one types twice as fast as the second one.

    The first = 2/3

    The second = 1/3

    For first case we have the following proportion:

    2/3 : 4=1 : x

    x · 2/3 = 4

    x=6

    Therefore, the first finished the book alone for the 6 days.

    For second case we have the following proportion:

    1/3 : 4=1 : x

    x · 1/3 = 4

    x=12

    Therefore, the second finished the book alone, for the 12 days.
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