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Sally and Marta had the same number of postcards. After Sally sold 18 of her postcards, Marta had 4 times as many postcards as Sally. How many postcards did each girl have to begin with?

  • math -

    4(x-18)=x
    4x-72=x
    3x=72
    x=72/3
    x=24

  • math -

    First multiply 18 by 4 it equals 72.

    Divide 72 by 3 and you get your answer ( the answer is 24

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