Question
Penelope and Emma's total mass is 51 kg. Emma and Elyse's total mass is 89 kg. Elyse is three times as heavy as Penelope. What is the average mass of the three friends?
3 m

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Penelope and Emma's total mass is 51 kg. Emma and Elyse's total mass is 89 kg. Elyse is three times as heavy as Penelope. What is the average mass of the three friends?