The Panyu Library opens at 8:00 a.m. and closes at 6:00 p.m., how many hours is it open every day
番禺图书馆每天早上8时开馆，下午6时闭馆，每天开放的时间是多少小时
<gadget id="calculator">18 - 8</gadget>
<output>10</output>

<result>10</result>