An amount of 40% acid solution is to be mixed with enough 10% acid solution to make 25%acid solution

题目

An amount of 40% acid solution is to be mixed with enough 10% acid solution to make 25%acid solution.If there are to be 20 litres of the final mixture,how much of each solution should be mixed together?
谷歌翻译:40％的溶液量要足够的10％溶液,使25％的溶液混合.如果有要20公升的最终混合物,每个解决方案如何shouldbe多混在一起?

答案

设40%的溶液为X
10%的溶液为Y
水 为 （20-X-Y)
满足关系4X+Y=50
以上单位都为L