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ZX-AF49CA1A5D2025年12月美国A卷 · 第 18 题
2025年12月美国A卷 · 原库模块 2 · Q18 原库参考解析
When x liters of a 40% acid solution is mixed with y liters of a 60% acid solution, 12 liters of a 50% acid solution is produced. Which system of equations represents this situation? (Assume that the volume of the mixture is the sum of the volumes of the two solutions before they were mixed.)
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