construction team expects to finish repairing a section of road in 30 days. First, 18 people will complete the project in 12 days (1/3). Now, due to the urgent task, the task needs to be completed 6 days ahead of schedule. How many more people are needed?
某工程队预计30天修完一段公路，先由18人修12天后完成工程的(1/3)，现因任务紧急，需要提前6天完成任务，还需增加多少人？
<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>