Question
There are 8 girls and 4 boys.
The average height of the 8 girls is 154 cm.
The average height of 4 boys is 139 cm.
What is the average height of all the children?
2 m

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There are 8 girls and 4 boys.
The average height of the 8 girls is 154 cm.
The average height of 4 boys is 139 cm.
What is the average height of all the children?