Question
Xuan and Marion's total mass is 57 kg. Marion and Nicole's total mass is 85 kg. Nicole is three times as heavy as Xuan. What is the average mass of the three friends?
3 m

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Xuan and Marion's total mass is 57 kg. Marion and Nicole's total mass is 85 kg. Nicole is three times as heavy as Xuan. What is the average mass of the three friends?