Homework Help: math word problems

Posted by lori on Sunday, October 2, 2011 at 12:14pm.

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 word problems - Steve, Monday, October 3, 2011 at 5:06am
s = m
(s-18)*4 = m

4s-72 = s
3s = 72
s = 24

they both started with 24
sally sold 18, leaving her with 6. marta then had 4 times that.

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