P and Q are two alloys of gold and copper prepared by mixing metals in the ratio 7 2 and 7 11 r...........

Quantitative Aptitude ( CCS) Mixture and Alligation

P and Q are two alloys of gold and copper prepared by mixing metals in the ratio 7 : 2 and 7 : 11 resp. If equal quantities of the alloys are melted to form a third alloy R, Find the ratio of gold and copper.

6 : 7

7 : 5

4 : 3

5 : 6

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Explanation:

Solution:
In 1 kg of alloy P, Gold = 7/9
Copper = 2/9
In 1 kg of alloy Q, Gold = 7/18
Copper = 11/18
Therefore, Ratio of Gold and Copper in alloy R
= 7/9 + 7/18 : 2/9 + 11/18
= 21 : 15 = 7 : 5