The engineering team has to dig a 3 km long canal, digging 25% of the total length every day, how many days can it be completed.
工程队要挖一条3千米长的水渠，每天挖全长的25%，多少天可以挖完．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<result>4</result>