Suckless SAT Practice

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Practice one SAT question at a time

Questions come from the Bluebook question bank.

A sample of a certain alloy has a total mass of $50.0$ grams and is $50.0 percent sign$ silicon by mass. The sample was created by combining two pieces of different alloys. The first piece was $30.0 percent sign$ silicon by mass and the second piece was $80.0 percent sign$ silicon by mass. What was the mass, in grams, of the silicon in the second piece?