Question:`A` and `B` are two alloys of gold and copper prepared by mixing metals in the ratio `7 : 2` and `7 : 11` respectively. If equal quantities of the alloys are melted to form a third alloy `C`, the ratio of gold and copper in `C` will be : 

A `5 : 9` 
B `5 : 7` 
C `7 : 5` 
D `9 : 5` 

+ Answer
C 

+ Explanation
Gold in `C = (7/9 + 7/(18)) = 7/6.`

Copper in `C = (2/9 + (11)/(18)) = 5/6.`

Gold : Copper `= 7/6 : 5/6 = 7 : 5.`

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Md. Habib Ullah

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