GMAT Quantitative Reasoning Practice Test 1

Question : 3 of 100

Marks: +1, -0

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?

Solution:

The first expression is even and the second is odd, the only difference between the expressions is that the first expression has

X

and the second has

W

. So, if

X

is even

W

must be odd.

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