The sum of the ages of Xiaoqing and her father is 38 years old. Xiaoqing's age is 4 times older than her father's age by 2 years. What is the age difference between Xiaoqing and her father?
小青与爸爸年龄之和为38岁，小青年龄的4倍比爸爸年龄多2岁，小青与爸爸年龄相差多少岁．
<gadget id="calculator">2 + 38</gadget>
<output>40</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">38 - 8 - 8</gadget>
<output>22</output>

<result>22</result>