A project can be completed in 30 days if 40 people do it. If 50 people come to do it, how many days can it be completed?
一项工程，如果40人来做，30天可以完成．如果50人来做，多少天可以完成？
<gadget id="calculator">30 / 50</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">40 * (3/5)</gadget>
<output>24</output>

<result>24</result>