When Dad was at Xiaojun’s age, Xiaojun was only 3 years old. When Xiaojun reached Dad’s age, Dad was already 78 years old. How old is Dad now?
爸爸在小军那个年龄时，小军只有3岁，小军长到爸爸的年龄时，爸爸已经78岁了，求爸爸现在多少岁．
<gadget id="calculator">78 - 3</gadget>
<output>75</output>

<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<gadget id="calculator">25 + 3</gadget>
<output>28</output>

<gadget id="calculator">28 + 25</gadget>
<output>53</output>

<result>53</result>