A workshop processes 1240 parts. It used to process 50 parts per day. After working for 20 days, it changed to process 60 parts per day. In this way, the task can be completed in a few more days?
某车间加工1240个零件，原来每天加工50个，工作20天后，改为每天加工60个，这样再加工几天就能完成任务？
<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">1_240 - 1_000</gadget>
<output>240</output>

<gadget id="calculator">240 / 60</gadget>
<output>4</output>

<result>4</result>