A barrel of gasoline used up its (2/7) on the first day, and 47.5 kilograms on the second day. This is 17.5 kilograms left in the barrel. How many kilograms was there in the barrel of gasoline?
一桶汽油第一天用去了它的(2/7)，第二天用去了47.5千克，这是桶里还剩17.5千克，这桶汽油原来有多少千克？
<result>71</result>