An engineering team planned to spend two weeks with 40 workers to complete the road laying task of Xichang Bird Watching Wetland Park. After working for 2 days, another 20 workers were added. If every worker works at the same rate, ask: How many days in advance can the road-laying task be completed?
某工程队计划用40名工人花两周时间完成西昌市观鸟湿地公园的道路铺设任务，工作2天后又增加了20名工人．如果每名工人的工作效率都相同，问：可以提前几天完成道路铺设任务？
<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">(1/14) * 2</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 40 / 14</gadget>
<output>1/560 = around 0.001786</output>

<gadget id="calculator">40 + 20</gadget>
<output>60</output>

<gadget id="calculator">(1/560) * 60</gadget>
<output>3/28 = around 0.107143</output>

<gadget id="calculator">(6/7) / (3/28)</gadget>
<output>8</output>

<gadget id="calculator">14 - 2 - 8</gadget>
<output>4</output>

<result>4</result>