Question
Raeann and Rachel's total mass is 39 kg. Rachel and Sarah's total mass is 81 kg. Sarah is three times as heavy as Raeann. What is the average mass of the three friends?
3 m

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Raeann and Rachel's total mass is 39 kg. Rachel and Sarah's total mass is 81 kg. Sarah is three times as heavy as Raeann. What is the average mass of the three friends?