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If k is a positive integer and the tens digit of k+5 is 4

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If k is a positive integer and the tens digit of k+5 is 4 [#permalink] New post 29 Aug 2010, 11:22
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If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k?

(1) k > 35
(2) The units digit of k is greater than 5
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Re: Ten's digit + 5 (GMATPrep q29) [#permalink] New post 30 Aug 2010, 08:24
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alienfluid wrote:
I can't seem to understand the question - how can a digit + 5 = 4? Are we talking about rounding numbers here?

Can someone please explain? :(


Hi,
It's been asked about tens digit of K+5=4 hence its possible to have 4 as answer....
Answer should be B.
My explanation for the answer as follows;
1. K>35
Stmt one satisfies many numbers starting from 36 till 44 where tens digit of k+5 is 4 (E.g. 36+5=41, 37+5=42....41+5=46). Here tens digit of K has two options either 3 or 4 hence can't answer uniqure number K.

2. Unit Digit of K is >5
For this we have only 4 options available which satisfies tens digit of k+5=4 condition. Numbers are 36, 37, 38 and 39. All these 4 numbers have only one unique number as tens digit i.e. 3 Hence we got our answer. Hence B is suff to answer the question.

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Re: Ten's digit + 5 (GMATPrep q29) [#permalink] New post 31 Aug 2010, 03:28
Question is not telling digit + 5 it is telling number + 5
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Re: Ten's digit + 5 (GMATPrep q29) [#permalink] New post 01 Sep 2010, 14:08
Question stem says 40 <= k+5 <= 49, thus 35 <= k <= 44
Statement 1 says k > 35, thus 36 <= k <= 44. Tens digit could be 3 or 4, insufficient
Taking into account the range of k provided in the question stem, statement 2 says that 36 <= k <= 39. Units digit must be 3, sufficient
Answer B
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Re: Ten's digit + 5 (GMATPrep q29) [#permalink] New post 12 Sep 2010, 17:11
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alienfluid wrote:
I can't seem to understand the question - how can a digit + 5 = 4? Are we talking about rounding numbers here?

Can someone please explain? :(


I solved it this way:

Stmt1:

Now the possible values satisfying this statement and question statement are:
where, nos in bold represtents K.

36+5=41
37+5=42
38+5=43
'
'
'
till 44+5=49

But since there are are two answers for ten's Digit of K ie 3 and 4, stmt 1 is NS.

Now taking stmt2 alone we can say that all the values where K's Ten's digits is 3 qualifies the statement condition, hence it is sufficient alone.All other values with K's Ten's digits as 4 will not qualify because in that case the 2nd stmt condition that K's unit digit is greater than 5 is not met.

Hope it is clear!!!
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Re: Ten's digit + 5 (GMATPrep q29) [#permalink] New post 12 Sep 2010, 20:31
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If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k?

Translate the stem: "the tens digit of k+5 is 4" --> 40\leq{k+5}\leq{49} --> 35\leq{k}\leq{44} --> so the tens digit of k could be 3 or 4.

Side note: strictly speaking k could be more than two digit number (for example 3-digit x40\leq{k+5}\leq{x49} ), though as we are interested only in units and tens digit then this wouldn't change anything and we can neglect other digits.

(1) k > 35 --> just tells us that k\neq{35}, so we have 35<{k}\leq{44} --> the tens digit of k could still be 3 or 4. Not sufficient.

(2) The units digit of k is greater than 5 --> k could only be 36, 37, 38, 39 --> so the tens digit of k is 3. Sufficient.

Answer: B.
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Re: Ten's digit + 5 (GMATPrep q29) [#permalink] New post 13 Sep 2010, 05:23
I had interpreted the question as tenth digit of K when added by 5 gives 4. So tenth digit can be 9.

Did anyone else interpret like this? Confusion is if 5 is added to number or tens digit
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Re: Ten's digit + 5 (GMATPrep q29) [#permalink] New post 26 Feb 2011, 14:25
udaymathapati wrote:
alienfluid wrote:
I can't seem to understand the question - how can a digit + 5 = 4? Are we talking about rounding numbers here?

Can someone please explain? :(


Hi,
It's been asked about tens digit of K+5=4 hence its possible to have 4 as answer....
Answer should be B.
My explanation for the answer as follows;
1. K>35
Stmt one satisfies many numbers starting from 36 till 44 where tens digit of k+5 is 4 (E.g. 36+5=41, 37+5=42....41+5=46). Here tens digit of K has two options either 3 or 4 hence can't answer uniqure number K.

2. Unit Digit of K is >5
For this we have only 4 options available which satisfies tens digit of k+5=4 condition. Numbers are 36, 37, 38 and 39. All these 4 numbers have only one unique number as tens digit i.e. 3 Hence we got our answer. Hence B is suff to answer the question.

If you like explanation, consider for kudos.... :-D



I agree. The way the question is worded is misleading. Initially even I took it to be the tens digit of a number + 5 = 4 i.e. if a two digit number was say TU then T+5 =4. It made no sense. So I decided that it was one of those badly worded questions and took it to be k + 5 instead of T + 5.
Once I got that correct, the question seemed pretty straight forward from there on... The trap here is that the question doesn't ask for the number k, rather asks what is the tens digit i.e. T. Thus B is sufficient.
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If k is a positive integer and the tens digit of k+5 is 4, what [#permalink] New post 01 May 2013, 10:13
getzgetzu wrote:
If k is a positive integer and tens digit of k+5 is 4, what is the tens digit of k?

1. k>35
2. The units digit of k is greater than 5.


Hi, For me the answer for this DS is E ...... but different guys gave different answers for this, Can Elaborate & discuss, this Pls.
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Re: If k is a positive integer and the tens digit of k+5 is 4, w [#permalink] New post 02 May 2013, 01:56
Expert's post
manishuol wrote:
getzgetzu wrote:
If k is a positive integer and tens digit of k+5 is 4, what is the tens digit of k?

1. k>35
2. The units digit of k is greater than 5.


Hi, For me the answer for this DS is E ...... but different guys gave different answers for this, Can Elaborate & discuss, this Pls.


The correct answer is B. Check here: if-k-is-a-positive-integer-and-the-tens-digit-of-k-5-is-100041.html#p780539

Hope it helps.
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Re: If k is a positive integer and the tens digit of k+5 is 4 [#permalink] New post 06 May 2013, 12:06
If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k?

(1) k > 35
(2) The units digit of k is greater than 5

1) K > 35 . It can be 36,37,.....40,41.....etc.
In case K< 40 than the answer is 3. If K>=40 and K <45 than the answer is 4. Insufficient.

2)Units digit is greater than 5. In this scenario, the integer has to be less than equal to 40. Therefore tens digit is 3. Hence B.
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Re: If k is a positive integer and the tens digit of k+5 is 4 [#permalink] New post 25 Sep 2014, 06:10
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Re: If k is a positive integer and the tens digit of k+5 is 4   [#permalink] 25 Sep 2014, 06:10
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