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21 February, 22:47

Mary and her brother john collect foreign coins. mary has 3 times the number of coins that john has. together they have 180 foreign coins. find how many coins mary has.

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  1. 21 February, 23:08
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    Total is 180

    m+j=180

    m has 3 times j

    m=3j

    sub 3j for m

    3j+j=180

    4j=180

    divide both sides by 4

    j=45

    sub

    m=3j

    m=3 (45)

    m=135

    mary has 135 coins
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