Question
Usha and Diana's total mass is 30 kg. Diana and Risa's total mass is 86 kg. Risa is three times as heavy as Usha. What is the average mass of the three friends?
3 m

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Usha and Diana's total mass is 30 kg. Diana and Risa's total mass is 86 kg. Risa is three times as heavy as Usha. What is the average mass of the three friends?