The engineering team completed (2/9) of a project in 4 days, how many days will it take to complete the whole project.
工程队4天完成了一项工程的(2/9)，完成全项工程需多少天．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(2/9) / 4</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">1 / (1/18)</gadget>
<output>18</output>

<result>18</result>