Xiaohong is 9 years old, Xiaoli is 6 years old, and Xiaolan is the same age as Xiaohong. What is the average age of the three of them?
小红9岁，小丽6岁，小兰和小红一样大，她们三人的平均年龄是多少．
<gadget id="calculator">9 + 6 + 9</gadget>
<output>24</output>

<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<result>8</result>