Two years ago, there was a 24-year difference between my mother's age and Mingming's. My mother is 28 years old this year, how old is Mingming this year?
两年前，妈妈的年龄和明明的年龄相差24岁．今年妈妈28岁，今年明明的年龄是多少岁呢？
<gadget id="calculator">28 - 24</gadget>
<output>4</output>

<result>4</result>