Two barrels of oil weigh a total of 25 kilograms. If 5 kilograms are poured out of barrel A, the two barrels have the same amount of oil. How many kilograms of oil is in barrel B?
两桶油共重25千克，如果从甲桶倒出5千克，两桶油就一样多，原来乙桶油有多少千克．
<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>