Xiaojun is 6 years old this year, and his mother is 5 times his age this year. How many years later, the mother's age is three times the age of Xiaojun.
小军今年6岁，妈妈今年的年龄是他的5倍．多少年后，妈妈的年龄是小军年龄的3倍．
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 - 6</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>