解;设要蒸发掉x千克水,
200×10%=(200-x)×16%,
32-0.16x=20,
20+0.16x=32,
20+0.16x-20=32-20,
0.16x=12,
0.16x÷0.16=12÷0.16,
x=75.
答;要蒸发掉75千克水.
一桶盐水,重200千克,含盐率是10%,要使含盐率达到16%,要蒸发掉多少千克水?
一桶盐水,重200千克,含盐率是10%,要使含盐率达到16%,要蒸发掉多少千克水?
数学人气:208 ℃时间:2019-11-02 01:27:06
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