Question
The average mass of a group of 11 children is 35 kg and the average mass of another group of 19 children is 38 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 35 kg and the average mass of another group of 19 children is 38 kg. What is the average mass of the two groups of children?