Civil Service Exam Reviewer · Ratio and Proportion · hard
Alloy X contains gold and copper in the ratio 4 : 5; alloy Y contains them in the ratio 5 : 1. If equal weights of X and Y are melted together, what is the ratio of gold to copper in the new alloy?
- 23 : 13
- 3 : 2
- 13 : 23
- 20 : 5
Answer
A. 23 : 13
Solution
Take 54 units of each. Gold = 24 + 45 = 69; copper = 30 + 9 = 39. Ratio = 23 : 13.
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