According to experts, the ratio of daily activity time to sleep time for children over 8 years old is 5:3, so children over 8 years old can sleep as many hours a day as they want.
据专家介绍，8岁以上的儿童每天活动时间和睡眠时间的比是5：3，那么8岁以上的儿童每天睡多少小时即可．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

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

<gadget id="calculator">24 * (3/8)</gadget>
<output>9</output>

<result>9</result>