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Primary school mathematics era
Mao Mao is two years older than Yao Yao, which means that Yao Yao is two years younger than Mao Mao.

Eiko is four years younger than Mao Mao.

Yao Yao is 2 years old and Mao Mao is 4 years old. These three people are as old as Mao Mao.

So Mao Mao's age:

(24+2+4)÷3= 10 years old

Yao Yao: 10-2-8 years old

Eiko: 10-4=6 years old