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1. |
Alloy A contains copper and zinc in the ratio 4 ∶ 5 and alloy B contains copper and zinc in the ratio 7 ∶ 2, A and B are taken in the ratio 7 ∶ 4 and melted to form a new alloy. The percentage of copper in the new alloy is closest to: |
A. | 57.76% |
B. | 65.25% |
C. | 56.57% |
D. | 67.5% |
Answer» D. 67.5% | |