Lions sleep about 18 hours a day, and koalas sleep more than lions (1/9). How many hours do koalas sleep each day?
狮子每天的睡眠时间大约是18小时，树袋熊每天的睡眠时间比狮子多(1/9)．树袋熊每天的睡眠时间大约是多少小时？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 + (1/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">18 * (10/9)</gadget>
<output>20</output>

<result>20</result>