There are two beautiful monkey kings, and the age of the elder brother (5/9) is exactly (2/3) the age of the younger brother, so what is the minimum sum of the ages of the two monkeys?
两只美猴王，猴哥哥年龄的(5/9)恰好是猴弟弟年龄的(2/3)，那么两只猴子年龄之和的最小值是多少．
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<result>11</result>