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Dr. Wang used 95% alcohol solution and 70% alcohol solution to prepare 75% disinfectant alcohol.
(95-75): (75-70) = 20: 5 = 4:1... The mass ratio of 70% alcohol solution to 95% alcohol solution.

1000× 4/5 = 800g ... mass of 70% alcohol solution.

1000×1/5 = 200g ... the mass of 95% alcohol solution.

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