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# If k and y are integers, and 10k + y is odd, which of the following

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Joined: 02 Sep 2009
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If k and y are integers, and 10k + y is odd, which of the following  [#permalink]

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20 Mar 2016, 23:36
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If k and y are integers, and 10k + y is odd, which of the following must be true?

A. k is odd
B. k is even
C. y is odd
D. y is even
E. both k and y are odd

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Re: If k and y are integers, and 10k + y is odd, which of the following  [#permalink]

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21 Mar 2016, 05:08
1
Bunuel wrote:
If k and y are integers, and 10k + y is odd, which of the following must be true?

A. k is odd
B. k is even
C. y is odd
D. y is even
E. both k and y are odd

For 10k + y to be odd since 10k is always even, y must be odd

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If k and y are integers, and 10k + y is odd, which of the following  [#permalink]

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25 Apr 2016, 14:05
10k will be always even as 10 has 2 as one of its factors
if 10k+y is odd, then the only possible explanation is that y is odd
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Re: If k and y are integers, and 10k + y is odd, which of the following  [#permalink]

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18 Apr 2017, 04:22
Bunuel wrote:
If k and y are integers, and 10k + y is odd, which of the following must be true?

A. k is odd
B. k is even
C. y is odd
D. y is even
E. both k and y are odd

to get odd result out of 10k+y
y must be odd since in 10k whether k is odd or even reult is always even and as per condition to get an odd result by adding two number
E+O=O
So we must need Y an odd number
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Re: If k and y are integers, and 10k + y is odd, which of the following  [#permalink]

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24 Apr 2017, 16:57
1
Bunuel wrote:
If k and y are integers, and 10k + y is odd, which of the following must be true?

A. k is odd
B. k is even
C. y is odd
D. y is even
E. both k and y are odd

Since an even number times any number is even, we know that 10k must be even. Also, since an even number plus an odd number is odd, we know that y must be odd.

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Re: If k and y are integers, and 10k + y is odd, which of the following  [#permalink]

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24 Nov 2018, 08:40
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Re: If k and y are integers, and 10k + y is odd, which of the following   [#permalink] 24 Nov 2018, 08:40
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