Question
Cindy and Penelope's total mass is 42 kg. Penelope and Zara's total mass is 68 kg. Zara is three times as heavy as Cindy. What is the average mass of the three friends?
3 m

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Cindy and Penelope's total mass is 42 kg. Penelope and Zara's total mass is 68 kg. Zara is three times as heavy as Cindy. What is the average mass of the three friends?