Master Zhang needs to process 600 parts. It is known that he processed 120 parts in the first 3 days. According to this calculation, how many days will it take to process the remaining parts?
张师傅要加工600个零件，已知他前3天加工了120个零件，照这样计算，剩下的零件还要加工多少天？
<gadget id="calculator">600 - 120</gadget>
<output>480</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">480 / 40</gadget>
<output>12</output>

<result>12</result>