Teacher Chen asked Grandpa Li how old this year, Grandpa Li said: "How old are you? How old is your son?" Teacher Chen replied: "I am 29 years old this year, and my son is 3 years old." Grandpa Li said: "My granddaughter 26 years old, 9 years later, the age of the three of you is equal to my age last year." How old is this Grandpa Li?
陈老师问李爷爷今年多大年纪了，李爷爷说："你今年多少岁？你儿子几岁？"陈老师回答说："我今年29岁，儿子3岁．"李爷爷说："我孙女今年26岁，9年后，你们三人的年龄和等于我去年的年龄．"这位李爷爷多大年纪了？
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">29 + 3 + 26 + 27 + 1</gadget>
<output>86</output>

<result>86</result>