Question
Lucy and Xandra's total mass is 36 kg. Xandra and Anna's total mass is 72 kg. Anna is three times as heavy as Lucy. What is the average mass of the three friends?
3 m

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Lucy and Xandra's total mass is 36 kg. Xandra and Anna's total mass is 72 kg. Anna is three times as heavy as Lucy. What is the average mass of the three friends?