Question
Gillian and Hilda's total mass is 60 kg. Hilda and Kathy's total mass is 90 kg. Kathy is three times as heavy as Gillian. What is the average mass of the three friends?
3 m

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Gillian and Hilda's total mass is 60 kg. Hilda and Kathy's total mass is 90 kg. Kathy is three times as heavy as Gillian. What is the average mass of the three friends?