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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 : 7
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B
5 : 9
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C
7 : 5
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D
9 : 5
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Solution

## The correct option is C 7 : 5Let 100 gm of alloy A and 100 gm of alloy BGold in alloy A=79×100copper in alloy A=29×100Gold in alloy B=718×100Copper in alloy B=1118×100Gold in alloy C=7009+70018=210018Copper in alloy C=2009+110018=150018Ratio of copper and iron in alloy C=210018:150018 7:5

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