Civil Service Exam Reviewer · Ratio and Proportion · hard
Alloy X contains gold and copper in the ratio 3 : 2; alloy Y contains them in the ratio 3 : 4. If equal weights of X and Y are melted together, what is the ratio of gold to copper in the new alloy?
- 1 : 1
- 17 : 18
- 18 : 17
- 9 : 8
Answer
C. 18 : 17
Solution
Take 35 units of each. Gold = 21 + 15 = 36; copper = 14 + 20 = 34. Ratio = 18 : 17.
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