Xiao Ming is 8 years old this year, and his father is 38 years old this year. When Xiao Ming is asked how old he is, his father's age is exactly twice his age?
小明今年8岁，其父今年38岁，问小明多少岁时，父亲的年龄恰好是他的年龄的2倍？
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">38 - 16</gadget>
<output>22</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">22 / 1</gadget>
<output>22</output>

<gadget id="calculator">22 + 8</gadget>
<output>30</output>

<result>30</result>