The two bottles of oil weigh 3.2 kg in total. After 0.7 kg of oil is used up in the large bottle, the weight ratio of the remaining oil in the large bottle to the oil in the small bottle is 3:2. Find out how many kilograms of oil were originally contained in the large bottle?
两瓶油共重3.2千克，大瓶油用去了0.7千克后，大瓶剩下的油与小瓶内油的重量比是3：2，求大瓶子里原来装有多少千克油？
<result>3.2</result>