Question
The total mass of Ivan and Tim is 65.5 kg. The total mass of Tim and Billy is 44.3 kg. If the total mass of Ivan and Billy is 68 kg, find the mass of Billy.
4 m

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The total mass of Ivan and Tim is 65.5 kg. The total mass of Tim and Billy is 44.3 kg. If the total mass of Ivan and Billy is 68 kg, find the mass of Billy.