To build a (3/5) kilometer long canal, and (1/4) of it was repaired in 3 days, how many days will it be completed?
修一条(3/5)千米长的水渠，3天修了它的(1/4)，多少天修完？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 3</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<result>12</result>