The age difference between mother and son is 24, and the age ratio of mother and son is 3:1, so what is the son
母子俩的年龄差是24，母子俩的年龄比是3：1，那么儿子是多少
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<result>12</result>