单选题:现有420克浓度为9%的盐水和若干浓度为5%的盐水,将这两种盐水混合,最多可配出多少克浓度为6.4%的盐水?

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题目内容:
现有420克浓度为9%的盐水和若干浓度为5%的盐水,将这两种盐水混合,最多可配出多少克浓度为6.4%的盐水? A.800
B.900
C.1000
D.1200

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