Answer:
A: 27000 seats, B: 14200 seats, C: 12800 seats
Step-by-step explanation:
A + B + C = 54000
B + C = A
=> 2A = 54000 => A = 27000
=> B + C = 27000 => C = 27000 - B
25A + 20B + 15C = 1151000
25x27000 + 20B + 15(27000 - B) = 1151000
=> B = 14200
=> C = 27000 - 14200 = 12800