The sum of the ages of Xiaohua and Xiaohong this year is 22 years old. Three years ago, Xiaohua was 2 years older than Xiaohong. How old is Xiaohong this year?
今年小华和小红的年龄和是22岁，3年前小华比小红大2岁，小红今年多少岁．
<gadget id="calculator">22 - 2</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>