batch of parts is planned to process 24 parts per day, and the task is completed in 20 days. In fact, 120 parts are processed in 4 days. According to this calculation, how many days will the processing tasks of these parts be completed? (Solution with proportional knowledge)
一批零件计划每天加工24个，20天加工完成任务，实际4天就加工了120个，照这样计算，这些零件的加工任务几天完成？(用比例知识解)
<gadget id="calculator">20 * 24</gadget>
<output>480</output>

<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">480 / 30</gadget>
<output>16</output>

<result>16</result>