Question
Tammy and Kylie's total mass is 33 kg. Kylie and Abi's total mass is 87 kg. Abi is three times as heavy as Tammy. What is the average mass of the three friends?
3 m

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Tammy and Kylie's total mass is 33 kg. Kylie and Abi's total mass is 87 kg. Abi is three times as heavy as Tammy. What is the average mass of the three friends?