要配制成浓度60%的酒精溶液15千克要从浓度为70％的酒精溶液和浓度为55％的酒精溶液中各取多少?
人气：167 ℃ 时间：2020-02-04 07:46:10
解答
设要70％的酒精溶液质量为x,则要55％的酒精溶液质量为15-x
70%x+55%（15-x）=15*60%解得x=5千克
所以要浓度为70％的酒精溶液5千克,浓度为55％的酒精溶液10千克.
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