hard · GMAT Quant
A manufacturing plant produces a composite material using two grades of aluminum, Grade 1 and Grade 2. Grade 1 aluminum contains 2 percent impurities, and Grade 2 aluminum contains 12 percent impurities.
If the final composite material contains exactly 5 percent impurities, what is the ratio of the mass of Grade 1 aluminum used to the mass of Grade 2 aluminum used?
- 7 to 3
- 3 to 7
- 7 to 10
- 3 to 10
- 2 to 1
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