Xiaoqing was a years old last year, 2 years younger than Xiaohong, what is Xiaohong this year? age. a + how much
小青去年a岁，比小红小2岁，小红今年是？岁．a+多少
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>