A road is 20 kilometers long, and 5 kilometers have been repaired. What percentage of the total length is not repaired?
一条公路全长20千米，已经修了5千米，问没修的占全长的几分之几．
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">15 / 20</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>