The "winter solstice" in the Chinese lunar calendar is the day with the shortest day and the longest night in a year. On this day, the daytime in western Hunan is nighttime (5/7). How many hours is the night.
中国农历中的"冬至"是一年中白昼最短、黑夜最长的一天，这一天，湘西的白天时间是黑夜的(5/7)．这天黑夜是多少小时．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 + (5/7)</gadget>
<output>12/7 = around 1.714286</output>

<gadget id="calculator">24 / (12/7)</gadget>
<output>14</output>

<result>14</result>