Question
The average mass of a group of 12 pupils is 35 kg and the average mass of another group of 18 pupils is 38 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 35 kg and the average mass of another group of 18 pupils is 38 kg. What is the average mass of the two groups of pupils?