A project with 12 workers can be completed in 15 days. If they are required to complete in 10 days, how many workers are needed to do it?
一项工程12个工人可以在15天完成．如果要求他们10天完成，需要几个工人来做？
<gadget id="calculator">1 / 15 / 12</gadget>
<output>1/180 = around 0.005556</output>

<gadget id="calculator">(1/180) * 10</gadget>
<output>1/18 = around 0.055556</output>

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

<result>18</result>