Xiaoxiao is 8 years old this year, his grandfather is 8 times older than Xiaoxiao, his father is 25 years younger than his grandfather, how old is his father this year?
笑笑今年8岁，爷爷的年龄是笑笑的8倍，爸爸比爷爷少25岁，爸爸今年几岁？
<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">64 - 25</gadget>
<output>39</output>

<result>39</result>