Question
Kathy and Marion's total mass is 39 kg. Marion and Rachel's total mass is 83 kg. Rachel is three times as heavy as Kathy. What is the average mass of the three friends?
3 m

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Kathy and Marion's total mass is 39 kg. Marion and Rachel's total mass is 83 kg. Rachel is three times as heavy as Kathy. What is the average mass of the three friends?