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if you have 15 coins in a bag and their total amount is $2.70 how many quarters and dimes are in the bag? Use substitution to solve

  • math -

    q+d=15
    .25q+.10d=2.70

    d=15-q

    .25q+.10(15-q)=2.70
    .25q+1.50-.10q=2.70
    .25q-.10q=1.20
    .15q=1.20
    q=8

    q+d=15
    8+d=15
    d=15-8
    d=7

    d stands for dimes
    q stands for quarters

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