Mom is 37 years old and Naughty is 9 years old. What is the average age of the two?
妈妈37岁，淘气9岁，两人的平均年龄是多少岁．
<gadget id="calculator">37 + 9</gadget>
<output>46</output>

<gadget id="calculator">46 / 2</gadget>
<output>23</output>

<result>23</result>