The power plant bought 300 tons of coal and transported 12 trucks with a load of 20 tons, and the rest with a small truck with a load of 12 tons. How many more trucks do they need to transport?
电厂买进300吨煤，用载重20吨的大卡车运了12车，剩下的用载重12吨的小卡车运，还需要运几车？
<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">300 - 240</gadget>
<output>60</output>

<gadget id="calculator">60 / 12</gadget>
<output>5</output>

<result>5</result>