2025 · Q55
Two alloys X and Y of copper and zinc are mixed. [Exact quantities could not be verified]
Elementary MathematicsRatio and Proportion
- A5:8
- B5:7
- C6:7
- D7:8
Explanation
The alloy-mixing quantities could not be recovered (options 5:8, 5:7, 6:7, 7:8). The stored key B (5:7) agrees with the published coaching key (PW, CDS 2 2025 Set A). Note: key disputed - independent verification inconclusive.