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4 February, 13:38

Mary, Chau, and David have a total of $87 i their wallets. Marry has 9$ more than Chau. David has two times what Mary has. How much do they have in each wallet?

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  1. 4 February, 13:46
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    Mary = 24

    Chau = 15

    David = 48

    Step-by-step explanation:

    The formula is

    Mary + Chau + David = 87

    And we know that

    Chau = Mary - 9

    David = Mary * 2

    So when we fill this in

    Mary + Mary - 9 + Mary * 2 = 87

    4Mary - 9 = 87

    4Mary = 96

    Mary = 24

    Chau = Mary - 9 = 15

    David = Mary * 2 = 48
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