Question
Nora and Gem's total mass is 42 kg. Gem and Irene's total mass is 74 kg. Irene is three times as heavy as Nora. What is the average mass of the three friends?
3 m

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Nora and Gem's total mass is 42 kg. Gem and Irene's total mass is 74 kg. Irene is three times as heavy as Nora. What is the average mass of the three friends?