This year, my mother is 34 years old and Xiaojun is 4 years old. After many years, my mother will be three times the age of Xiaojun.
今年妈妈34岁，小军4岁，多少年后，妈妈的年龄是小军的3倍．
<gadget id="calculator">34 - 4</gadget>
<output>30</output>

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

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 - 4</gadget>
<output>11</output>

<result>11</result>