Question
The average mass of a group of 12 pupils is 39 kg and the average mass of another group of 18 pupils is 40 kg. What is the average mass of the two groups of pupils?
3 m

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The average mass of a group of 12 pupils is 39 kg and the average mass of another group of 18 pupils is 40 kg. What is the average mass of the two groups of pupils?