A bus can take 45 people, and a train can take 30 people 12 times more than a bus. How many more people are there in a train than in a bus?
一辆大客车可以乘座45人，一列火车乘座的人数比一辆大客车的12倍多30人．一列火车乘座的人数比一辆大客车多多少人？
<gadget id="calculator">45 * 12</gadget>
<output>540</output>

<gadget id="calculator">30 - 45</gadget>
<output>-15</output>

<gadget id="calculator">540 + (-15)</gadget>
<output>525</output>

<result>525</result>