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X and Y are positive numbers. Is the hundredth digit of XY

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Current Student
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Status: pg
Joined: 09 Dec 2011
Posts: 16
Location: Brazil
Schools: Tuck '16 (M)
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Kudos [?]: 6 [0], given: 1

X and Y are positive numbers. Is the hundredth digit of XY [#permalink] New post 06 Jun 2012, 12:38
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A
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C
D
E

Difficulty:

  5% (low)

Question Stats:

83% (01:44) correct 17% (01:00) wrong based on 6 sessions
X and Y are positive numbers. Is the hundredth digit of XY greater than 6?

(1) The tenth digit of X is greater than 2.
(2) The tenth digit of y is greater than 3.
[Reveal] Spoiler: OA
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Joined: 19 May 2012
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Kudos [?]: 2 [1] , given: 1

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Re: Please help, DS question [#permalink] New post 06 Jun 2012, 12:58
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I just started my GMAT preparation and this is my first post. So please correct/guide me if I am being wrong :-D

I think, for this kind of questions, you just have to substitute some random numbers and test the given statements. By picking X=31, and Y=41, XY=1271; the given condition becomes False. But, if you pick X=61, and Y=61, XY=3721; the condition becomes True.

So the answer is E. Always be careful while picking up the numbers and do bunch of iterations and also keep your eye on the clock.
Current Student
avatar
Status: pg
Joined: 09 Dec 2011
Posts: 16
Location: Brazil
Schools: Tuck '16 (M)
Followers: 1

Kudos [?]: 6 [0], given: 1

Re: Please help, DS question [#permalink] New post 06 Jun 2012, 13:05
pmikki wrote:
I just started my GMAT preparation and this is my first post. So please correct/guide me if I am being wrong :-D

I think, for this kind of questions, you just have to substitute some random numbers and test the given statements. By picking X=31, and Y=41, XY=1271; the given condition becomes False. But, if you pick X=61, and Y=61, XY=3721; the condition becomes True.

So the answer is E. Always be careful while picking up the numbers and do bunch of iterations and also keep your eye on the clock.



But what worries me is that it takes time if you pick the wrong numbers, but thanks for the help
Re: Please help, DS question   [#permalink] 06 Jun 2012, 13:05
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X and Y are positive numbers. Is the hundredth digit of XY

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