hard · GMAT Quant
A manufacturing firm produces a metal alloy from two source materials, Alpha and Beta. Material Alpha is 90 percent pure, and Material Beta is 70 percent pure.
If the final alloy is 75 percent pure, what is the ratio of the mass of Material Alpha used to the total mass of the alloy?
- dfrac14
- dfrac13
- dfrac31
- dfrac34
- dfrac15
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