One day a store sold 32 sweatshirts, white ones cost $11.95 and yellow ones cost $11.50. in all, $373.40 worth of sweatshirts were sold. how many of each color were sold?

32=w+y, w=32-y...

11.95w+11.5y=373.4, using w from above gives us:

11.95(32-y)+11.5y=373.4

382.4-11.95y+11.5y=373.4

-.45y=-9

y=20

So 20 yellow and (32-20) 12 white shirts were sold. 

2xy/9 is the answer to this problem