To build a road, build 0.5 kilometers every day, and complete it in 36 days. If 0.6 kilometers are repaired every day, how many days can it be completed? (Solution by proportional method)
修一条公路，每天修0.5千米，36天完成．如果每天修0.6千米，多少天可修完？(用比例方法解)
<gadget id="calculator">36 * 0.5</gadget>
<output>18</output>

<gadget id="calculator">18 / 0.6</gadget>
<output>30</output>

<result>30</result>