Question
Hilda and Abi's total mass is 30 kg. Abi and Barbara's total mass is 68 kg. Barbara is three times as heavy as Hilda. What is the average mass of the three friends?
3 m

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Hilda and Abi's total mass is 30 kg. Abi and Barbara's total mass is 68 kg. Barbara is three times as heavy as Hilda. What is the average mass of the three friends?