Question
Yen and Min's total mass is 36 kg. Min and Fiona's total mass is 80 kg. Fiona is three times as heavy as Yen. What is the average mass of the three friends?
3 m

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Yen and Min's total mass is 36 kg. Min and Fiona's total mass is 80 kg. Fiona is three times as heavy as Yen. What is the average mass of the three friends?