Question
Lucy and Penelope's total mass is 33 kg. Penelope and Gem's total mass is 71 kg. Gem is three times as heavy as Lucy. What is the average mass of the three friends?
3 m

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Lucy and Penelope's total mass is 33 kg. Penelope and Gem's total mass is 71 kg. Gem is three times as heavy as Lucy. What is the average mass of the three friends?