Question
There are 3 boys and 9 girls.
The average height of the 3 boys is 122 cm.
The average height of 9 girls is 106 cm.
What is the average height of all the children?
2 m

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There are 3 boys and 9 girls.
The average height of the 3 boys is 122 cm.
The average height of 9 girls is 106 cm.
What is the average height of all the children?