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ZX-1A2A4B7F85PSAT10 P2 · 第 1 题
PSAT10 P2 · 原库模块 1 · Q1 原库参考解析
A mixture consisting of only vitamin D and calcium has a total mass of 150 grams. The mass of vitamin D in the mixture is 50 grams. What is the mass, in grams, of calcium in the mixture?
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