To build a 300-meter-long road, 60 meters were built in 5 days. According to this calculation, how many days will it take to complete the repair? (Solve with ratio)
修一条长300米的公路，5天修了60米，照这样计算，还要几天才能修完？(用比例解)
<gadget id="calculator">300 - 60</gadget>
<output>240</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">240 / 12</gadget>
<output>20</output>

<result>20</result>