Dad is 35 years old this year, and Xiaohong is 10 years old this year. Four years later, how much older is Dad than Xiaohong?
爸爸今年35岁，小红今年10岁．4年后，爸爸比小红大多少岁．
<gadget id="calculator">35 - 10</gadget>
<output>25</output>

<result>25</result>