The engineering team completes (2/5) of a project in 6 days. According to this calculation, how many days will it take to complete the entire project.
工程队6天完成一项工程的(2/5)，照这样计算，完成全部工程要多少天．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 6</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>