Question
Lynn and Marion's total mass is 30 kg. Marion and Shiyun's total mass is 66 kg. Shiyun is three times as heavy as Lynn. What is the average mass of the three friends?
3 m

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Lynn and Marion's total mass is 30 kg. Marion and Shiyun's total mass is 66 kg. Shiyun is three times as heavy as Lynn. What is the average mass of the three friends?