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

B

5 : 9

C

7 : 5

D

9 : 5

Easy

Solution

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Correct option is C)

Let 100 gm of alloy A and 100 gm of alloy B
Gold  in alloy A=
copper in alloy A=
Gold in alloy B=
Copper in alloy B=
Gold in alloy C=
Copper in alloy C=
Ratio of copper and iron in alloy C=
                                                      


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