含盐的量是=40kg*10%=4kg
蒸发的水的数量设为x
那么,4kg/(40kg-x)=80%
解的x=35kg
将含盐率为百分之10的40千克盐水,蒸发成含盐百分之八十的食盐晶体颗粒,需要蒸发掉多少千克的水?
将含盐率为百分之10的40千克盐水,蒸发成含盐百分之八十的食盐晶体颗粒,需要蒸发掉多少千克的水?
数学人气:184 ℃时间:2020-01-31 02:06:42
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