Question
Vanessa and Tammy's total mass is 39 kg. Tammy and Usha's total mass is 69 kg. Usha is three times as heavy as Vanessa. What is the average mass of the three friends?
3 m

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Vanessa and Tammy's total mass is 39 kg. Tammy and Usha's total mass is 69 kg. Usha is three times as heavy as Vanessa. What is the average mass of the three friends?