A project is completed in 20 days, how many days can complete 25% of the project.
一项工程20天完成，多少天可以完成这项工程的25%．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/4) / (1/20)</gadget>
<output>5</output>

<result>5</result>