Dad is three times as old as Fang Fang, and grandpa is twice as old as Dad. Dad is 33 years old this year. May I ask: How old is the age difference between grandpa and grandson?
爸爸的年龄是芳芳的3倍，爷爷的年龄是爸爸的2倍，爸爸今年33岁，请问：爷孙相差多少岁？
<gadget id="calculator">33 * 2</gadget>
<output>66</output>

<gadget id="calculator">33 / 3</gadget>
<output>11</output>

<gadget id="calculator">66 - 11</gadget>
<output>55</output>

<result>55</result>