Women bought some large frames for $18 each and some small frames for $6 each at a close out sale. If she bought 18 frames for $144, find how many of each type she bought.

Answer 1

Let L = # large and S = # small

L + S = 18

18L + 6S = 144

Divide the 2nd equation by 6: 3L + S = 24

Subtract the first equation for the divided 2nd equation

2L = 6

L=3

S=15