Question
Kimberly and Yen's total mass is 30 kg. Yen and Zoe's total mass is 60 kg. Zoe is three times as heavy as Kimberly. What is the average mass of the three friends?
3 m

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Kimberly and Yen's total mass is 30 kg. Yen and Zoe's total mass is 60 kg. Zoe is three times as heavy as Kimberly. What is the average mass of the three friends?