If Bill can buy 3 pairs of jeans and 2 shirts for $69 or 2 pairs of jeans and 3 shirts for $66, how much does one shirt cost?
Choose the correct option: A) $ 10 B) $ 12 C) $ 13.20 D) $ 15 E) $ 16.80

Rationale: "let the price of one shirt be ss and of jeans be j : 3 j + 2 s = 69 2 j + 3 s = 66 subtracting the second from the first gives : j − s = 3 or j = s + 3 plug j in either of the equations and solve for s , which is $ 12 answer : b ."
Answer: B