1.

Alloy A contains iron and copper in ratio 4 : 5. Alloy B contains iron and copper in ratio 3 : 4. If 45 kg of alloy A and 63 kg of alloy B are mixed, then what is the final ratio of copper and iron?

A. 61 : 47
B. 57 : 41
C. 59 : 45
D. 64 : 47
Answer» B. 57 : 41


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