The sum of the ages of Xiaoqiang and his father this year is 48, and the age ratio is 1:3. How old is Xiaoqiang this year?
今年小强和爸爸的年龄之和是48岁，年龄之比是1：3，小强今年多少岁．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>