The combined age of Li Hong and her mother is 43 years old, and her mother is 23 years older than Li Hong. How old is Li Hong?
李红和她妈妈今年年龄的和是43岁，妈妈比李红大23岁，李红今年多少岁．
<gadget id="calculator">43 - 23</gadget>
<output>20</output>

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

<result>10</result>