Question
Natalie and Betty's total mass is 57 kg. Betty and Marion's total mass is 89 kg. Marion is three times as heavy as Natalie. What is the average mass of the three friends?
3 m

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Natalie and Betty's total mass is 57 kg. Betty and Marion's total mass is 89 kg. Marion is three times as heavy as Natalie. What is the average mass of the three friends?