# math

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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.

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