Alice bought some drinks and snacks. The cost of a drink is 3/5 the cost of a snack. She paid $42 for 15 drinks and 12 snacks. How much did each drink cost?
d = 3/5 = 0.6 s
15 d +12 s = 42
15 (0.6 s) + 12 s= 42
9 s + 12 s = 42
21 s - 42
s = 2
d = 0.6 s = $1.20