The road repair team repaired a 120-kilometer road, and 20 kilometers were repaired in the first 4 days; at this speed, how many days will it take to complete the road? (Solve using ratio method)
修路队修一条长120千米的公路，前4天修了20千米；照这样的速度，修完全路共需要多少天？(用比例方法解答)
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">120 / 5</gadget>
<output>24</output>

<result>24</result>