A road has been repaired for 20 kilometers, and there is still 60 kilometers left to be repaired. What percentage of the total length of the road has been repaired?
一条公路已经修了20千米，还差60千米没有修，已经修了这条公路全长的百分之几？
<gadget id="calculator">20 + 60</gadget>
<output>80</output>

<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>