Question
Esther and Kylie's total mass is 45 kg. Kylie and Gwen's total mass is 85 kg. Gwen is three times as heavy as Esther. What is the average mass of the three friends?
3 m

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Esther and Kylie's total mass is 45 kg. Kylie and Gwen's total mass is 85 kg. Gwen is three times as heavy as Esther. What is the average mass of the three friends?