The average age of Nannan and Beibei is 1 1 year, and the average age of Dongdong and Nannan is1year. So how old is Beibei than Dongdong?

Beibei is bigger than Dongdong small 8.

Analysis: The total age of South-South and North-North is1× 2 = 22 (years old), and that of Dongdong and South-South is 15×2=30 (years old), so the age difference between North-North and East-East is 30-22=8 (years old).

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