After being laid off, Master Wang set up a night market on the street, from 8:00 every night to 3:00 the next morning, how many hours did he work?
王师傅下岗后在街头摆夜市，从每天晚上8：00干到第二天早晨3点，工作多少小时．
<gadget id="calculator">24 - 20</gadget>
<output>4</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<result>7</result>