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# What is the tens digit of the positive integer r?

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Math Expert
Joined: 02 Sep 2009
Posts: 46128
Re: What is the tens digit of the positive integer r? [#permalink]

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22 May 2018, 04:38
Rishovnits wrote:
Bunuel wrote:
What is the tens digit of the positive integer r?

Let $$r=abc$$, tens digit would be $$b$$, so the question is $$b=?$$

(1) The tens digit of r/10 is 3 --> $$\frac{r}{10}=ab.c$$ --> tens digit of this number is $$a$$, so $$a=3$$. No info about $$b$$. Not sufficient.

(2) The hundreds digit of 10r is 6 --> $$10r=abc0$$ --> hundreds digit of this number is $$b$$, so $$b=6$$. Sufficient.

Hello Bunuel,

Can you tell me why did you chose a three digit number? If we choose a 4 digit number, then the answer will be different.

Please check this: https://gmatclub.com/forum/what-is-the- ... ml#p787270
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Re: What is the tens digit of the positive integer r?   [#permalink] 22 May 2018, 04:38

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