To build a road, the completed ones account for 5/9 of the total length, and the unbuilt ones are much less than the completed ones.
修一条路，已修的占全长的(5/9)，未修的比已修的少多少．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>