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A and B are two alloys of gold and coppe...

`A and B` are two alloys of gold and copper prepared by mixing metals in proportions `7 : 2 and 7 : 11` respectively. If equal quantities of alloys are melted to form a third alloy C, then the proportion of gold and copper in C will be (1) 5 : 9 (2) 5 : 7 (3) 7 : 5 (4) 9 : 5 (5) None of these

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