An engineering team completed a project in 2 days (2/7). According to this calculation, how many days will it take for this engineering team to complete this project.
某工程队2天完成一项工程的(2/7)．照这样计算，这支工程队完成这项工程需要多少天．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

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

<gadget id="calculator">1 / (1/7)</gadget>
<output>7</output>

<result>7</result>