Question
Kimberly and Lynn's total mass is 36 kg. Lynn and Jean's total mass is 66 kg. Jean is three times as heavy as Kimberly. What is the average mass of the three friends?
3 m

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Kimberly and Lynn's total mass is 36 kg. Lynn and Jean's total mass is 66 kg. Jean is three times as heavy as Kimberly. What is the average mass of the three friends?