Yuejin Machine Tool Factory originally planned to manufacture 200 machine tools in 30 days, but only 40 machines were left unfinished in 20 days. According to this calculation, how many days can the task be completed in advance?
跃进机床厂原计划30天制造机床200台，结果做20天就只差40台没有做，照这样计算，可以提前几天完成任务？
<gadget id="calculator">200 - 40</gadget>
<output>160</output>

<gadget id="calculator">160 / 20</gadget>
<output>8</output>

<gadget id="calculator">40 / 8</gadget>
<output>5</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<result>5</result>