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29 April, 18:26

Alice collected stamps for 7 weeks. She counted the number of stamps in her collection every week. By week 2, there had been 7 stamps collected. How many stamps did Alice collect between week 5 and week 7? A. 5 B. 6 C. 17 D. 22

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  1. 29 April, 19:54
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    What we can do to solve this problem is the following rule of three:

    2 weeks - - - > 7 stamps

    7 weeks - - - > x

    Clearing x we have:

    x = (7/2) * 7 = 24.5

    The other rule of three is:

    2 weeks - - - > 7 stamps

    5 weeks - - - > x

    Clearing x we have:

    x = (5/2) * (7) = 17.5

    You have the following inequality

    17.5
    Thus

    x = 22

    answer:

    Alice collect between week 5 and week 7, 22 stamps.

    D. 22
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