math word problems
posted by lori .
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?

s = m
(s18)*4 = m
4s72 = s
3s = 72
s = 24
they both started with 24
sally sold 18, leaving her with 6. marta then had 4 times that. 
a box of chalk and 2 staplers cost ten dollars. three boxes of chalk and two staplers cost eighteen dollars. find the total of one box of chalk and one stappler

$7

18+6=24
2418=6
6x4=24
They both started off with 24 cards