Question
Jen and Elyse's total mass is 39 kg. Elyse and Xylia's total mass is 81 kg. Xylia is three times as heavy as Jen. What is the average mass of the three friends?
3 m

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Jen and Elyse's total mass is 39 kg. Elyse and Xylia's total mass is 81 kg. Xylia is three times as heavy as Jen. What is the average mass of the three friends?