A road has been built for 9 kilometers, which is 2 kilometers shorter than the full length (1/5). How long is this road in km?
一条路已经修了9千米，比全长的(1/5)少2km．这条路全长多少km？
<gadget id="calculator">9 + 2</gadget>
<output>11</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">11 / (1/5)</gadget>
<output>55</output>

<result>55</result>