Xiao Ming made up a question like this: I was born in April, twice my age plus 8, exactly the total number of days in the month I was born, what is Xiao Ming’s age
小明编了这样一道题：我是4月出生的，我的年龄的2倍加上8，正好是我出生那月的总天数，小明的年龄是多少岁
<gadget id="calculator">30 - 8</gadget>
<output>22</output>

<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<result>11</result>