If an engineering team can complete a project in 3 days (3/5), how many days can it complete all the projects?
一个工程队3天能完成一项工程的(3/5)，多少天能完成全部工程．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 3</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>