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a bank teller has 54 in $5 and $20 bill s. the total value is $780. how many 5 dollars are there

  • math -

    34

  • math -

    X+y=54
    5x+20y=780

    -5(x+y=54)

    -5x-5y=-270
    5x+20y=780

    15y=510
    Y=34
    X=20

    5(20)+20(34)=780
    Five dollars bills = 20

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