Three bags of corn, A, B, and C, weigh 600 catties in total. If you sell 20% of bag A, 25% of bag B, and 35% of bag C, you will have a total of 447 catties left; if you sell 35% of bag A, 25% of the B bag and 20% of the C bag, a total of 438 catties are left. So, how much is the third bag of corn oil?
甲、乙、丙三袋玉米共重600斤，如果卖出甲袋的20%、乙袋的25%、丙袋的35%，则共剩下447斤；如果卖出甲袋的35%、乙袋的25%、丙袋的20%，则共剩下438斤．那么，丙袋玉米油多少斤？
<result>120</result>