2026 · Q88
For the next two (02) items that follow:
X is an alloy of copper and zinc. Y is an alloy containing 80% of copper, 4% of zinc and 16% of tin. A fused mass of X and Y is found to contain 74% of copper, 16% of zinc and 10% of tin.
88. What is the percentage of zinc in X?
Elementary MathematicsRatio and Proportion
- A40%
- B36%
- C34%
- D30%
Explanation
X contains only copper and zinc, so with 64% copper it has 36% zinc, option B. As a check, 0.375×36+0.625×4=16% zinc, matching the fused mass. Any other zinc percentage would break the 16% zinc balance of the fused mass.