What is the tens digit of positive integer x? : GMAT Data Sufficiency (DS)
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What is the tens digit of positive integer x?

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Manager
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What is the tens digit of positive integer x? [#permalink]

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29 Jul 2011, 19:54
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OG11 - Q148) What is the tens digit of positive integer x?

1) x divided by 100 has a remainder of 30
2) x divided by 110 has a remainder of 30
[Reveal] Spoiler: OA

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Manager
Joined: 17 Dec 2010
Posts: 98
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GMAT 1: 690 Q48 V37
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Kudos [?]: 23 [0], given: 15

Re: Contradicting Statement 1 & 2 - OG Question [#permalink]

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29 Jul 2011, 19:56
False alarm - it's all 100% clear to me now

Even though the statements net different outcomes (i.e. "x" is a different number in each of the statements), the two statements aren't contradictory
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Re: Contradicting Statement 1 & 2 - OG Question [#permalink]

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30 Jul 2011, 01:26
Using statement (1), x will have a tens digit of 3 always. Sufficient.
Using statement (2), x can have a tens digit of 4 (as in 140) or 5(as in 250) and so on. Insufficient.

Therefore the answer is (A).
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Re: Contradicting Statement 1 & 2 - OG Question [#permalink]

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30 Jul 2011, 06:44
GyanOne wrote:
Using statement (1), x will have a tens digit of 3 always. Sufficient.
Using statement (2), x can have a tens digit of 4 (as in 140) or 5(as in 250) and so on. Insufficient.

Therefore the answer is (A).

Can you explain how you reached the conclusion for statement (2) that the tens digit will be 4 or 5?
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Re: Contradicting Statement 1 & 2 - OG Question [#permalink]

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31 Jul 2011, 03:47
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If x=140, then x divided by 110 will leave a remainder of 30. In this case the tens digit of x is 4.
If x=250, then x divided by 110 will leave a remainder of 30. In this case the tens digit of x is 5.

I used these two as examples just to illustrate that two different answers are possible for the tens digit, and so statement (2) alone is insufficient. These two examples do not form an exhaustive set of examples for the tens digit in x as defined. In fact, if we list out all cases, x can have a tens digit of 0 to 9 (both inclusive), and still leave 30 as a remainder when divided by 110.

Hope this clarified.
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Re: Contradicting Statement 1 & 2 - OG Question   [#permalink] 31 Jul 2011, 03:47
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