The road construction team expects to build a road in 30 days. First, 18 people will only complete the whole project in 12 days (1/3). If you want to finish the project 6 days ahead of schedule, how many more people do you need?
筑路队预计30天修一条公路，先由18人修12天只完成全部工程的(1/3)．如果想提前6天完工，还需要增加多少人？
<gadget id="calculator">30 - 12 - 6</gadget>
<output>12</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 / (2/3)</gadget>
<output>18</output>

<result>18</result>