Civil Service Exam Reviewer · Ratio and Proportion · hard
Alloy X contains gold and copper in the ratio 4 : 3; alloy Y contains them in the ratio 3 : 1. If equal weights of X and Y are melted together, what is the ratio of gold to copper in the new alloy?
- 7 : 4
- 19 : 37
- 37 : 19
- 12 : 3
Answer
C. 37 : 19
Solution
Take 28 units of each. Gold = 16 + 21 = 37; copper = 12 + 7 = 19. Ratio = 37 : 19.
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