40-40×16%÷20%，
=40-32，
=8（千克）；
答：蒸发8千克水后可将浓度提高到20%．
有含盐率16%的盐水40千克，蒸发多少千克水后可将浓度提高到20%？
有含盐率16%的盐水40千克，蒸发多少千克水后可将浓度提高到20%？
数学人气：790 ℃时间：2020-04-12 16:18:13
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