Huanhuan goes to bed at 9 o'clock every night. He got up at 6 o'clock the next morning. How many hours do you sleep every day?
欢欢每天晚上9时睡觉．他第二天早上6时起床．每天睡多少小时．
<gadget id="calculator">12 - 9</gadget>
<output>3</output>

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

<result>9</result>