There are 540 bags of grain in the warehouse, and they are first transported by a mini truck, with 15 bags per trip, and 12 trips, and the rest are transported by a large truck, with 45 bags per trip, how many more trips?
货仓有540袋粮食，先用一辆微型车运，每趟装15袋，运了12趟，剩下的用一辆大货车运，每趟车装45袋，还要运几趟？
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">540 - 180</gadget>
<output>360</output>

<gadget id="calculator">360 / 45</gadget>
<output>8</output>

<result>8</result>