Question
The average mass of a group of 12 children is 40 kg and the average mass of another group of 18 children is 37 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 12 children is 40 kg and the average mass of another group of 18 children is 37 kg. What is the average mass of the two groups of children?