Drum A contains 66 kg of soybean oil and Drum B contains 48 kg of soybean oil. How many kilograms of soybean oil are poured from barrel A into barrel B, and the soybean oil in both barrels A and B weighs the same?
甲桶有豆油66千克，乙桶有豆油48千克．甲桶往乙桶里倒多少千克后，甲、乙两个桶的豆油同样重？
<result>7</result>