将含盐30%的盐水500克稀释成含盐20%的盐水,需加清水多少克?

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将含盐30%的盐水500克稀释成含盐20%的盐水,需加清水多少克?

将含盐30%的盐水500克稀释成含盐20%的盐水,需加清水多少克?
将含盐30%的盐水500克稀释成含盐20%的盐水,需加清水多少克?

将含盐30%的盐水500克稀释成含盐20%的盐水,需加清水多少克?