Xiaohua is 6 years old this year, and her father said to Xiaohua: "When you grow up to be 10 years old, I will be 40 years old." How old is Dad?
小花今年6岁，爸爸对小花说："你长到10岁的时候，我正好40岁．"爸爸今年多少岁？
<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">6 + 30</gadget>
<output>36</output>

<result>36</result>