Civil Service Exam Reviewer · Ratio and Proportion · hard
Alloy X contains gold and copper in the ratio 3 : 1; alloy Y contains them in the ratio 1 : 2. If equal weights of X and Y are melted together, what is the ratio of gold to copper in the new alloy?
- 13 : 11
- 4 : 3
- 11 : 13
- 3 : 2
Answer
A. 13 : 11
Solution
Take 12 units of each. Gold = 9 + 4 = 13; copper = 3 + 8 = 11. Ratio = 13 : 11.
More Ratio and Proportion questions
- If 6 kilograms of pork cost ₱1,860, how much will 47 kilograms cost?
- A recipe for 8 servings uses 6 cup(s) of flour. How many cups are needed for 17 servings?
- If A : B = 2 : 4 and B : C = 5 : 2, what is A : B : C?
- On a map, 1 cm represents 20 km. Two towns are 13 cm apart on the map. What is the actual distance?
- If 13 kilograms of pork cost ₱4,420, how much will 50 kilograms cost?
- ₱6,800 is shared among Ana, Ben and Carlo in the ratio 4 : 5 : 1. How much does Carlo receive?
- Two numbers are in the ratio 4 : 7, and their difference is 39. What is the larger number?
- If A : B = 6 : 7 and B : C = 6 : 1, what is A : B : C?
- On a map, 1 cm represents 20 km. Two towns are 2 cm apart on the map. What is the actual distance?
- If 8 kilograms of pork cost ₱1,840, how much will 31 kilograms cost?