A certain factory received an order on April 30, and the factory planned to complete it in May (working overtime on rest days). Therefore, 18 workers were dispatched to work for 12 days, and one-third of the entire task was completed. If the delivery is to be made one day earlier, how many more workers are needed?
某工厂4月30日收到一份订单，厂方计划5月份完成(休息日均加班)，于是，先出18名工人工作了12天，完成了全部任务的三分之一，后来情况有变，要提前一天交货，那么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">31 - 12 - 1</gadget>
<output>18</output>

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

<gadget id="calculator">(2/3) / 18 / (1/648)</gadget>
<output>24</output>

<gadget id="calculator">24 - 18</gadget>
<output>6</output>

<result>6</result>