Question
Sabrina and Kathy's total mass is 54 kg. Kathy and Joelle's total mass is 86 kg. Joelle is three times as heavy as Sabrina. What is the average mass of the three friends?
3 m

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Sabrina and Kathy's total mass is 54 kg. Kathy and Joelle's total mass is 86 kg. Joelle is three times as heavy as Sabrina. What is the average mass of the three friends?