Question
Tina and Jen's total mass is 39 kg. Jen and Jean's total mass is 89 kg. Jean is three times as heavy as Tina. What is the average mass of the three friends?
3 m

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Tina and Jen's total mass is 39 kg. Jen and Jean's total mass is 89 kg. Jean is three times as heavy as Tina. What is the average mass of the three friends?