2025年11月国际A卷 · 第 16 题

2025年11月国际A卷 · 原库模块 2 · Q16 原库参考解析

A biologist mixed a solution that is 0.3% sodium chloride by mass with a solution that is 0.15% sodium chloride by mass to obtain a new solution, which has a mass of 80 grams and contains 0.21 grams of sodium chloride. How many grams of 0.3% sodium chloride solution did the biologist use?

2025年11月国际A卷 · 第 16 题

解题思路

联系老师