workshop plans to process 540 parts, and 180 were made in the first 2 days. According to this calculation, how many days will it take to complete the parts? (Answer with proportional knowledge)
某车间计划加工540个零件，前2天做了180个，照这样计算，做完零件需要多少天？(用比例知识解答)
<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<gadget id="calculator">540 / 90</gadget>
<output>6</output>

<result>6</result>