9] : [12000 x 3 + (12000 + 5000) x 9] : (21000 x 6)= (16 x 3 + 11 x 9) : (12 x 3 + 17 x 9) : (21 x 6)= 147 : 189 : 126 = 7 : 9 : 6Hence, B's share exceeds C's share by = {13200/(7 + 9 + 6)} x (9 - 6) = (13200 x 3)/22 = 1800