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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 5Does 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 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.

 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>35Stmt 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 >5For 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 <= 44Statement 1 says k > 35, thus 36 <= k <= 44. Tens digit could be 3 or 4, insufficientTaking into account the range of k provided in the question stem, statement 2 says that 36 <= k <= 39. Units digit must be 3, sufficientAnswer B

 Author: bumpbot [ 24 Jan 2023, 02:27 ] Post subject: Re: If k is a positive integer and the tens digit of k+5 is 4, Hello from the GMAT Club BumpBot!Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

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