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ZX-6E3FF11320PSAT10 P2 · 第 22 题
PSAT10 P2 · 原库模块 1 · Q22 原库参考解析
A sample of a certain alloy has a total mass of 50.0 grams and is 50.0% silicon by mass. The sample was created by combining two pieces of different alloys. The first piece was 30.0% silicon by mass and the second piece was 80.0% silicon by mass. What was the mass, in grams, of the silicon in the second piece?
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