Weiwei is 8 years old this year, and his father is 34 years old. In a few more years, Dad's age will be three times that of Weiwei's.
伟伟今年8岁，爸爸34岁．再过多少年，爸爸的年龄是伟伟的三倍．
<gadget id="calculator">34 - 8</gadget>
<output>26</output>

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

<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<result>5</result>