Question
The total mass of Andy and Ethan is 57 kg. The total mass of Ethan and Riordan is 42.2 kg. If the total mass of Andy and Riordan is 57 kg, find the mass of Riordan.
4 m

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The total mass of Andy and Ethan is 57 kg. The total mass of Ethan and Riordan is 42.2 kg. If the total mass of Andy and Riordan is 57 kg, find the mass of Riordan.