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sally and marta had the same number of postards. after sally sold 18 postards, marta had 4 times as many as sally. how many ostcards did eeach girl have to begin with

  • math -

    Sally has X postcards.
    Marta has X postcards.

    X = 4(X-18)
    Solve for X.

  • math -

    24

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