Processing a batch of parts, the original plan is to process 40 parts per day, and it will be completed in 60 days. The actual processing is 10 fewer than the original plan per day. How many days will the task be completed? (Solve with ratio)
加工一批零件，原计划每天加工40个，60天完成，实际每天比原计划少加工10个，实际多少天完成任务？(用比例解)
<gadget id="calculator">40 * 60</gadget>
<output>2_400</output>

<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">2_400 / 30</gadget>
<output>80</output>

<result>80</result>