Question
Yoko and Xuan's total mass is 44 kg. Xuan and Erika's total mass is 77 kg. Erika is four times as heavy as Yoko. What is the average mass of the three friends?
3 m

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Yoko and Xuan's total mass is 44 kg. Xuan and Erika's total mass is 77 kg. Erika is four times as heavy as Yoko. What is the average mass of the three friends?