这天,唐僧师徒四人西天取经经过一块西瓜地,悟空和八戒请求看瓜的老汉送一个西瓜给师徒四人解渴。老汉想了想,说:“看在你们是出家人的面上,我出一个题目考考你们,答对了就送给你们一个西瓜,答不上就对不起了。”老汉接着说:“我今年69岁,我有三个孙子,分别是25、15和5岁,请问几年后,我的年龄与三个孙子的年龄和相同?” On this day, the monks and mentors, four people, passed away after a piece of watermelon, Goku and Jurisprudence asked to see the melon sent a watermelon to the mentor and his four thirst quencher. The old man thought for a moment and said: “Look at you are the monk’s face, I test you a question, answer right gave you a watermelon, sorry to answer.” "The old man then said: I am 69 years old and I have three grandchildren, 25, 15 and 5 respectively. May I ask how many years later my age is the same as the age of three grandchildren?