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# If x>y and y is a positive integer, is y even?

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Math Expert
Joined: 02 Aug 2009
Posts: 7034
If x>y and y is a positive integer, is y even?  [#permalink]

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14 Nov 2017, 06:46
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Difficulty:

55% (hard)

Question Stats:

50% (01:45) correct 50% (01:08) wrong based on 34 sessions

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If $$x>y$$ and $$y$$ is a positive integer, is $$y$$ even?

(1) $$xy$$ is odd.
(2) $$x=y+2$$

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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
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3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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Re: If x>y and y is a positive integer, is y even?  [#permalink]

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14 Nov 2017, 07:34
We are not given whether x is an integer or not. But we know that y is a positive integer.

Statement 1: xy is odd. Now, if x is an integer, then y cannot be even, it has to be odd. Because product of two integers is odd ONLY if both are odd.
But if x is not an integer, then we cannot say. Eg - if x is 2.5 and y is 2 then xy = 2.5*2 = 5 (odd). Here y is even still xy is odd.
So Insufficient.

Statement 2: x = y+2. This tells us that x is also an integer, and also either both x/y are odd, or both x/y are even. Insufficient.

Combining the two, we know that both x/y are integers and the product is odd. So BOTH x/y have to be odd. Thus y cannot be even. Sufficient.

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Re: If x>y and y is a positive integer, is y even?  [#permalink]

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14 Nov 2017, 07:37
1
chetan2u wrote:
If $$x>y$$ and $$y$$ is a positive integer, is $$y$$ even?

(1) $$xy$$ is odd.
(2) $$x=y+2$$

y = even ?

1) xy = od
x = 3, y = 1 => xy = odd NO, y is odd
x = $$\frac{5}{2}$$, y = 2 => xy = odd YES, but y is even

2) x = y + 2
Insufficient. Y could be odd or even

1+2)
xy = odd
x = y + 2 => x is also a positive integer
=> y has to be odd.

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Re: If x>y and y is a positive integer, is y even? &nbs [#permalink] 14 Nov 2017, 07:37
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