A technical alloy requires copper and zinc in a mass ratio of . To produce of this alloy, how many kilograms of copper are needed?
Answer and explanation
Correct answer: C.
- Step 1: The total number of ratio parts is . Each part represents . The mass of copper required is . **Answer: . Why not the others:** is an arbitrary guess, would be an 8:2 ratio, and is an arithmetic error.
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