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If k is a positive integer and the tens digit of k+5 is 4 https://gmatclub.com/forum/ifkisapositiveintegerandthetensdigitofk5is100041.html 
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Author:  bekbek [ 06 Jan 2010, 21:18 ] 
Post subject:  If k is a positive integer and the tens digit of k+5 is 4, what is the 
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 Does it mean it can be: 36, 37 ... 44. from (1) statement and 36, 37, 38 and 39 from the (2) statement. and k is 3? 
Author:  Bunuel [ 12 Sep 2010, 20:31 ] 
Post subject:  Re: Ten's digit + 5 (GMATPrep q29) 
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 3digit \(x40\leq{k+5}\leq{x49}\) ), 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. 
Author:  udaymathapati [ 30 Aug 2010, 08:24 ] 
Post subject:  Re: Ten's digit + 5 (GMATPrep q29) 
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.... 
Author:  BeavisMan [ 01 Sep 2010, 14:08 ] 
Post subject:  Re: Ten's digit + 5 (GMATPrep q29) 
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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Post subject:  Re: If k is a positive integer and the tens digit of k+5 is 4, 
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