The age of Xiaohua and Xiaoling this year is 22 years old. Four years ago, Xiaohua was 8 years old. How old is Xiaoling?
今年小华和小玲的年龄和是22岁，4年前小华8岁，小玲多少岁．
<gadget id="calculator">22 - 4 - 8 - 4</gadget>
<output>6</output>

<result>6</result>