18*39 + 55*12 + 18*16 = 18*39 + 18*16 + 55*12 = 18*(39+16) + 55*12= 18*55 + 55*12 = 55*(18+12) = 55*30 = 1650
18*39 + 55*12 + 18*16 = 18*39 + 18*16 + 55*12 = 18*(39+16) + 55*12= 18*55 + 55*12 = 55*(18+12) = 55*30 = 1650