It takes 18 days to complete the laying of a section of railway by 10 people. If everyone has the same workload every day, and now the task needs to be completed 3 days ahead of schedule, how many more people are needed?
一段铁路10人铺设要18天完成，如果每个人每天工作量相同，现在要提前3天完成任务，需要增加多少人？
<gadget id="calculator">10 * 18</gadget>
<output>180</output>

<gadget id="calculator">1 / 180</gadget>
<output>1/180 = around 0.005556</output>

<gadget id="calculator">18 - 3</gadget>
<output>15</output>

<gadget id="calculator">(1/180) * 15</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<result>2</result>