To build a road with a length of 3000m, 600m has been repaired in the first 5 days. According to this calculation, the rest will be completed in a few days. (Solve with ratio)
修一条长3000m的路，前5天已修600m，照这样算，剩下的还要几天修完．(用比例解)
<gadget id="calculator">3_000 - 600</gadget>
<output>2_400</output>

<gadget id="calculator">600 / 5</gadget>
<output>120</output>

<gadget id="calculator">2_400 / 120</gadget>
<output>20</output>

<result>20</result>