To make 1,800 parts, it is planned to take 75 people to complete in 12 days. If 15 people are added, how many days can it be completed? (Each person has the same efficiency)
做1800个零件，计划用75人12天完成，如果增加15人，几天可以修完？(每人工效相同)
<gadget id="calculator">1_800 / 75 / 12</gadget>
<output>2</output>

<gadget id="calculator">75 + 15</gadget>
<output>90</output>

<gadget id="calculator">2 * 90</gadget>
<output>180</output>

<gadget id="calculator">1_800 / 180</gadget>
<output>10</output>

<result>10</result>