Question
The total mass of Valen and Simon is 73.2 kg. The total mass of Simon and Fred is 45 kg. If the total mass of Valen and Fred is 70 kg, find the mass of Fred.
4 m

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The total mass of Valen and Simon is 73.2 kg. The total mass of Simon and Fred is 45 kg. If the total mass of Valen and Fred is 70 kg, find the mass of Fred.