Uncle goes to work at 11pm and leaves at 7am the next morning. How many hours does he work?
叔叔晚上11时上班，第二天早上7时下班，他工作了多少小时？
<gadget id="calculator">12 - 11</gadget>
<output>1</output>

<gadget id="calculator">1 + 7</gadget>
<output>8</output>

<result>8</result>