题目内容
(请给出正确答案)
[单选题]
从装满l00克浓度为20%的盐水杯中倒出20克盐水,再加入清水将水加满,这样反复3次后,杯中盐水的浓度是()。
A.17.56%
B.17.42%
C.16.38%
D.10.24%
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A.17.56%
B.17.42%
C.16.38%
D.10.24%
A.7%
B.7.12%
C.7.22%
D.7.29%
A.48%
B.32%
C.28 .2%
D.17.28%
A.22.5%
B.24.4%
C.25.6%
D.27.5%