The sum of the ages of Zhang Hua and Li Li this year is 30 years old, Zhang Hua is 6 years older than Li Li, how old is Li Li this year?
今年张华和李丽的年龄之和是30岁，张华比李丽大6岁，今年李丽多少岁．
<gadget id="calculator">30 - 6</gadget>
<output>24</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<result>12</result>