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sonya spent 3/8 of her money and had $15 left. how much money did she orginally start with?

  • math -

    If Sonya spend 3/8 of her money, she has (1-3/8)=5/8 left.

    Use proportions:
    5/8 : $15
    1 : $x

    Use cross multiplication to get:
    $x=$15*1÷(5/8)
    =$15*(8/5)
    =$24

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