Question
Tiffany and Erika's total mass is 54 kg. Erika and Xylia's total mass is 84 kg. Xylia is three times as heavy as Tiffany. What is the average mass of the three friends?
3 m

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Tiffany and Erika's total mass is 54 kg. Erika and Xylia's total mass is 84 kg. Xylia is three times as heavy as Tiffany. What is the average mass of the three friends?