Question
Nora and Usha's total mass is 36 kg. Usha and Winnie's total mass is 70 kg. Winnie is three times as heavy as Nora. What is the average mass of the three friends?
3 m

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Nora and Usha's total mass is 36 kg. Usha and Winnie's total mass is 70 kg. Winnie is three times as heavy as Nora. What is the average mass of the three friends?