Question
The average mass of a group of 11 children is 39 kg and the average mass of another group of 19 children is 36 kg. What is the average mass of the two groups of children?
3 m

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The average mass of a group of 11 children is 39 kg and the average mass of another group of 19 children is 36 kg. What is the average mass of the two groups of children?