Question
Diana and Rachel's total mass is 36 kg. Rachel and Sabrina's total mass is 64 kg. Sabrina is three times as heavy as Diana. What is the average mass of the three friends?
3 m

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Diana and Rachel's total mass is 36 kg. Rachel and Sabrina's total mass is 64 kg. Sabrina is three times as heavy as Diana. What is the average mass of the three friends?