A factory expects to complete a batch of processing parts in 30 days. First, 18 workers worked for 12 days and completed (1/3) of the task. Now, due to the urgent task, all processing tasks need to be completed 6 days in advance. Q: How many additional workers are needed?
某工厂预计30天完成一批加工零件的任务，先由18名工人干了12天，完成了任务的(1/3)，现因任务紧急，需要提前6天完成全部加工任务．问：需要增加多少名工人？
<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">30 - 12 - 6</gadget>
<output>12</output>

<gadget id="calculator">(1/3) / 12 / 18</gadget>
<output>1/648 = around 0.001543</output>

<gadget id="calculator">(2/3) / 12 / (1/648)</gadget>
<output>36</output>

<gadget id="calculator">36 - 18</gadget>
<output>18</output>

<result>18</result>