To build a road, the full length (2/15) is built every day, how many days can it be completed?
修一条公路，每天修全长的(2/15)，几天可以修完？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / (2/15)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>