A road is 20 kilometers long, and 5 kilometers have been repaired. How much of the total length is not repaired (fill in a fraction)
一条公路长20千米，已修了5千米，没修的占全长的多少(填几分之几)
<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>