Master Wang has to process 1200 parts, and processed 240 parts in 3 days. According to this calculation, how many days will it take to complete the task? (proportional solution)
王师傅要加工1200个零件，3天加工了240个．照这样计算，还要用多少天完成任务？(比例解)
<gadget id="calculator">1_200 - 240</gadget>
<output>960</output>

<gadget id="calculator">240 / 3</gadget>
<output>80</output>

<gadget id="calculator">960 / 80</gadget>
<output>12</output>

<result>12</result>