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实验室烧杯内有盐水溶液若干，现在往烧杯内加入若干纯净水后测得浓度是 40%，然后再加入同样多的纯净水，测得浓度是 30%
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实验室烧杯内有盐水溶液若干，现在往烧杯内加入若干纯净水后测得浓度是 40%，然后再加入同样多的纯净水，测得浓度是 30%，那么，如果再加入同样多的纯净水，溶液的浓度是（ ）。

A 20%
B 24%
C 18%
D 12%

正确答案
B
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