It is known that Xiaoling was born in June, and adding 12 to 2 times Xiaoling's age is exactly the total number of days in June. Please guess how old Xiaoling is?
已知小玲是6月份出生的，小玲年龄的2倍加上12，正好是6月份的总天数．请你猜一猜小玲有多少岁？
<gadget id="calculator">30 - 12</gadget>
<output>18</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<result>9</result>