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OG 11 DS Question 148

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nuku888 Just gettin' started! Default Avatar
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OG 11 DS Question 148 Post Thu Apr 26, 2007 6:52 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    Hello,

    I was wondering if anyone could help me with this question. I read the explanation at the back but I don't really understand it.

    The question is:

    What is the tens digit of the positive integer x?

    1. X divided by 100 has a remainder of 30
    2. X divided by 110 has a remainder of 30

    What is the fastest way to find the what # gives you a remainder of 30 for statement 2? Or do I have to find it through trial and error?

    Also can anyone give me some tips on how to do these remainder questions I always mess up on them.

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    f2001290 GMAT Destroyer!
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    Post Thu Apr 26, 2007 9:36 pm
    Hi Nuku

    What is the solution ? I think that the answer is A

    I prefer trial and error for the second option.

    nuku888 Just gettin' started! Default Avatar
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    Post Mon Apr 30, 2007 3:18 pm
    Yups the answer is A

    jayhawk2001 Community Manager
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    Post Mon Apr 30, 2007 10:20 pm
    nuku888 wrote:
    Hello,

    I was wondering if anyone could help me with this question. I read the explanation at the back but I don't really understand it.

    The question is:

    What is the tens digit of the positive integer x?

    1. X divided by 100 has a remainder of 30
    2. X divided by 110 has a remainder of 30

    What is the fastest way to find the what # gives you a remainder of 30 for statement 2? Or do I have to find it through trial and error?

    Also can anyone give me some tips on how to do these remainder questions I always mess up on them.
    1 - Sufficient. X = 100n + 30. So tens digit has to be 3.

    2 - Insufficient. X = 110n + 30 = 100n + 10n + 30. So, tens digit
    depends on n, which we don't know

    Hence A

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