The father's age is 3.2 times that of Xiaoming's, and the age of his mother is 2.6 times that of Xiaoming's. It is known that his father is 9 years older than his mother, how old is Xiaoming.
爸爸的年龄是小明的3.2倍，妈妈的年龄是小明的2.6倍，已知爸爸比妈妈大9岁，小明多少岁．
<gadget id="calculator">3.2 - 2.6</gadget>
<output>0.6</output>

<gadget id="calculator">9 / 0.6</gadget>
<output>15</output>

<result>15</result>