This year, Dad's age is 6 times that of Xiao Ming, and in another 4 years, Dad's age will be 4 times that of Xiao Ming. How old is Xiao Ming this year?
今年，爸爸的年龄是小明的6倍，再过4年，爸爸的年龄就是小明的4倍．今年小明多少岁？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">16 - 4</gadget>
<output>12</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>