If a road of 20 kilometers is built, if (1/10) kilometers is built every day, how many days will it be completed?
修一条20千米的路，若每天修(1/10)千米，多少天修完．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 / (1/10)</gadget>
<output>200</output>

<result>200</result>