Question
Esther and Dana's total mass is 57 kg. Dana and Jean's total mass is 83 kg. Jean is three times as heavy as Esther. What is the average mass of the three friends?
3 m

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Esther and Dana's total mass is 57 kg. Dana and Jean's total mass is 83 kg. Jean is three times as heavy as Esther. What is the average mass of the three friends?