If it takes 15 days for three people to complete a job, how many days will it take for five people to complete the job?
三人完成一件工作需15天，五人完成这件工作需多少天．
<gadget id="calculator">1 / 15 / 3</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/45) * 5</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / (1/9)</gadget>
<output>9</output>

<result>9</result>