The results of three PEA dorm outings to Burger Palace: Dutch spent $54.39 for 14 burgers, 12 shakes, and 15 fries; Wentworth spent $291.95 for 81 burgers, 62 shakes, and 72 fries; Lamont spent $111.93 for 25 burgers, 33 shakes, and 29 fries. How much does an order of frie cost at Burger Palace?

1 answer

14b+12s+15f = 54.39
81b+62s+72f = 291.95
25b+33s+29f = 111.93
solve by your favorite method.