单选题:从装有500克浓度为20%1拘糖水瓶中倒出50克糖水后,再向瓶中倒入50克清水,如果将这个过程作为一次操作,请问,第三次

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题目内容:
从装有500克浓度为20%1拘糖水瓶中倒出50克糖水后,再向瓶中倒入50克清水,如果将这个过程作为一次操作,请问,第三次操作完成后,这瓶糖水的浓度变成了(  )。 A.16.23%
B.18.27%
C.14.58%
D.20.18%

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