The number of sunny days in Zhengzhou in November 2014 was 10 days, which was less than the number of cloudy days (2/7). How many days were cloudy days in Zhengzhou this month? (column equation solution)
郑州市2014年11月的晴天天数为10天，比多云天数少(2/7)，郑州市这个月的多云天数是多少天？(列方程解答)
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">10 / (5/7)</gadget>
<output>14</output>

<result>14</result>