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Algebra Difficulty 2.0 Junior Prove it Canada

Maria has a red package, a green package, and a blue package. The sum of the masses of the three packages is 60 kg. The sum of the masses of the red and green packages is 25 kg. The sum of the masses of the green and blue packages is 50 kg. What is the mass of the green package, in kg?

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.