To build a road with a total length of 20 kilometers, and 2.5 kilometers were built in the first 5 days. According to this calculation, how many days will it take to complete the road?
修一条公路，总长20千米，前5天修了2.5千米，照这样计算，修完这条路还要用多少天？
<gadget id="calculator">20 - 2.5</gadget>
<output>17.5</output>

<gadget id="calculator">2.5 / 5</gadget>
<output>0.5</output>

<gadget id="calculator">17.5 / 0.5</gadget>
<output>35</output>

<result>35</result>