The road construction team builds a section of road and completes (1/4) of this project in 5 days, and completes ((())/(())) of this project in 10 days. How many days are they all completed?
筑路队修一段路，5天完成这项工程的(1/4)，10天完成这项工程的((())/(()))，多少天全部完成．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 5</gadget>
<output>1/20 = around 0.05</output>

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

<result>20</result>