Question
The total mass of 2 plates and 9 mirrors is 3.9 kg. The total mass of 1 plate and 2 mirrors is 1.2 kg. What is the mass of each mirror?
4 m

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The total mass of 2 plates and 9 mirrors is 3.9 kg. The total mass of 1 plate and 2 mirrors is 1.2 kg. What is the mass of each mirror?