在20%的盐水中加入10千克水,浓度为15%.再加入多少千克盐,浓度为25%?
在20%的盐水中加入10千克水,浓度为15%.再加入多少千克盐,浓度为25%?
数学人气:173 ℃时间:2020-04-10 21:03:47
优质解答
设原来有盐水x千克,20%x÷(x+10)=15%, x=30;30×20%=6千克;设再加入Y克盐,(6+y)÷(30+10+y)=25%, &n...
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