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:

Alloy A contains copper and zinc in the ratio 4 ∶ 5 and alloy B co

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%

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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:

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