2026年6月国际C卷练习 · 第 12 题

2026年6月国际C卷练习 · 原库模块 2 · Q12 参考答案

A biologist mixed a solution that is 0.1% sodium chloride by mass with a solution that is 0.05% sodium chloride by mass to obtain a new solution, which has a mass of 90 grams and contains 0.07 grams of sodium chloride. How many grams of the 0.1% sodium chloride solution did the biologist use?

2026年6月国际C卷练习 · 第 12 题

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