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math

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andy has 23 coins worth 3.65 consisting of only quarters and dimes.how manydimes does he have?

  • math -

    =3.42

  • math -

    q+ d = 23 or d = 23-q
    25q + 10d = 365 or
    5q + 2d = 73

    sub in d = 23-q

    5q + 2(23-q) = 73
    5q + 46 - 2q = 73
    3q = 27
    q = 9
    then d = 14

    She has 14 dimes


    check:
    9(25) + 14(10) = 365 YEAH!

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