The daily sleep time of a lion is 18 hours, and the daily sleep time of a koala is equivalent to (8/9) of that of a lion. How many hours does a koala sleep approximately?
狮子每天的睡眠时间是18小时，树袋熊每天的睡眠时间相当于狮子的(8/9)，树袋熊每天的睡眠时间大约是多少小时？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">18 * (8/9)</gadget>
<output>16</output>

<result>16</result>