To build a road of 10 kilometers, if you build (1/5) kilometers every day, how many days will it be completed?
修一条10千米的路，若每天修(1/5)千米，多少天修完．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>