This year, the average age of me, my father, and my mother is exactly 29 years old. It is known that the average age of my father and mother is 38 years old. How old am I this year?
今年，我、爸爸、妈妈三人的平均年龄正好是29岁，已知爸爸和妈妈两人的平均年龄是38岁，我今年是多少岁．
<gadget id="calculator">29 * 3</gadget>
<output>87</output>

<gadget id="calculator">38 * 2</gadget>
<output>76</output>

<gadget id="calculator">87 - 76</gadget>
<output>11</output>

<result>11</result>