Câu 7: GMAT Section 2: Quantitative

X, Y, Z, and W are integers. The expression X-Y-Z is even and the Expression Y-Z-W is odd. If X is even what must be true?

1. A. Y-Z must be odd.
2. B. W must be even.
3. C. W must be odd. — đáp án hiện tại
4. D. W must be even.
5. E. Z must be odd