Xia Ming's daily life is very regular. He goes to bed at 9 o'clock in the evening and wakes up at 6 o'clock in the morning. About what percentage of the day does he sleep?
夏明每天的生活非常有规律，他每天晚上9点睡觉、早上6点起床．他每天大约有几分之几的时间处于睡眠状态？
<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">3 + 6</gadget>
<output>9</output>

<gadget id="calculator">9 / 24</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>