Question
Jade and Mary's total mass is 51 kg. Mary and Pamela's total mass is 85 kg. Pamela is three times as heavy as Jade. What is the average mass of the three friends?
3 m

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Jade and Mary's total mass is 51 kg. Mary and Pamela's total mass is 85 kg. Pamela is three times as heavy as Jade. What is the average mass of the three friends?