Think about it: There are two barrels of oil. After pouring 5 kg from the big barrel into the small barrel, the oil in the big barrel is equal to the oil in the small barrel. So, how much more oil is in the big barrel than in the small barrel?
想一想：有两桶油，从大桶倒入小桶5千克后，大桶里的油就与小桶的油相等，那么，原来大桶的油比小桶的油多多少？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>