Question
The total mass of Bryan and Gabriel is 57.8 kg. The total mass of Gabriel and Billy is 62.2 kg. If the total mass of Bryan and Billy is 61 kg, find the mass of Billy.
4 m

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The total mass of Bryan and Gabriel is 57.8 kg. The total mass of Gabriel and Billy is 62.2 kg. If the total mass of Bryan and Billy is 61 kg, find the mass of Billy.