Xiaoming's mother gave birth to three sons. The name of the eldest son is 10, and the name of the second son is 20. What's the name of the third son?

Chinese name: Xiaoming

Mbth: Xiaoming

Alias: Mingming

Nationality: China.

Ethnic group: Han nationality

Place of birth: China.

Occupation: the protagonist of primary school composition, math problems and jokes

Graduate school: Zhonghua Primary School.

Main achievements: active in various mathematical application problems and compositions.

Representative works: all kinds of teaching materials

Mother: Xiaoyue, Mrs. Li, Xiaoming's mother.

Father: I don't know. Probably Lao Wang next door.

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background introduction

Xiaoming is a figure who has occupied most of the pages of Chinese and mathematics textbooks in primary schools after 70, 80, 90 and 00 in the past 30 to 40 years. He is also called "the golden iron triangle" with Xiaohong and Xiaogang. The most famous joke about Xiao Ming is the dialogue between Xiao Ming and the teacher in the class "Get out".