Mother's age is 3.5 times Xiaonan's age, father's age is 3.8 times Xiaonan's age, mother is 3 years younger than father, how old is Xiaonan this year?
妈妈的年龄是小南年龄的3.5倍，爸爸年龄是小南年龄的3.8倍，妈妈比爸爸小3岁，小南今年几岁？
<gadget id="calculator">3.8 - 3.5</gadget>
<output>0.3</output>

<gadget id="calculator">3 / 0.3</gadget>
<output>10</output>

<result>10</result>