Question
Sarah and Penelope's total mass is 54 kg. Penelope and Irene's total mass is 76 kg. Irene is three times as heavy as Sarah. What is the average mass of the three friends?
3 m

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Sarah and Penelope's total mass is 54 kg. Penelope and Irene's total mass is 76 kg. Irene is three times as heavy as Sarah. What is the average mass of the three friends?