Xiaoya is 8 years old this year, and her mother is 4 times her age this year. After many years, her mother will be 3 times her age.
小雅今年8岁，妈妈今年年龄是她的4倍，多少年后，妈妈年龄是小雅的3倍．
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">32 - 8</gadget>
<output>24</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<result>6</result>