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ZX-47E3E77FF82026年3月国际C卷 · 第 4 题
2026年3月国际C卷 · 原库模块 1 · Q4 原库参考解析
A chemist mixed x liters of a 4% saline solution with y liters of a 7% saline solution to produce a 6% saline solution. Which equation best represents this situation? (Assume the volumes of the solutions are additive.)
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