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# In the fraction x/y, where x and y are positive integers,

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Manager
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In the fraction x/y, where x and y are positive integers, [#permalink]  02 Aug 2009, 12:41
00:00

Difficulty:

(N/A)

Question Stats:

75% (02:19) correct 25% (00:54) wrong based on 16 sessions
In the fraction x/y, where x and y are positive integers, what is the value of y?

(1) the least common denominator of x/y and 1/3 is 6

(2) x = 1

Senior Manager
Joined: 20 Mar 2008
Posts: 454
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Kudos [?]: 76 [0], given: 5

Re: Fun with Fractions [#permalink]  02 Aug 2009, 14:20
robertrdzak wrote:
In the fraction x/y, where x and y are positive integers, what is the value of y?

(1) the least common denominator of x/y and 1/3 is 6

(2) x = 1

(1): X/Y could be 1/2 or 1/6. Insuff.
(2): No info about y. Insuff.

Combined: Still same problem, cannot determine y. Hence, E
SVP
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Kudos [?]: 127 [0], given: 39

Re: Fun with Fractions [#permalink]  02 Aug 2009, 20:19
[quote="robertrdzak"]In the fraction x/y, where x and y are positive integers, what is the value of y?

(1) the least common denominator of x/y and 1/3 is 6

(2) x = 1

from 1

y could be 2 or 6.......insuff

from 2

insuff

both
1/6 or 1/2........insuff.E
Manager
Joined: 22 Mar 2008
Posts: 56
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Kudos [?]: 10 [0], given: 1

Re: Fun with Fractions [#permalink]  02 Aug 2009, 21:54
agree with E.
same reason
Manager
Affiliations: CFA L3 Candidate, Grad w/ Highest Honors
Joined: 03 Nov 2007
Posts: 130
Location: USA
Schools: Chicago Booth R2 (WL), Wharton R2 w/ int, Kellogg R2 w/ int
WE 1: Global Operations (Futures & Portfolio Financing) - Hedge Fund ($10bn+ Multi-Strat) WE 2: Investment Analyst (Credit strategies) - Fund of Hedge Fund ($10bn+ Multi-Strat)
Followers: 1

Kudos [?]: 41 [0], given: 9

Re: Fun with Fractions [#permalink]  04 Aug 2009, 19:28
E is correct.

thanks for the explination.
Manager
Joined: 25 Mar 2009
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Kudos [?]: 11 [0], given: 9

Re: Fun with Fractions [#permalink]  05 Aug 2009, 01:15
[quote]

1. Least denominator of x/y and 1/3 is 6 => y can be either 2 or 6, insuff -> B,C,E

2. x=1, deno of 1/y and 1/3 is 6 => y can be 2 or 6, insuff, -> C,E

1 & 2, together y can be 2 or 6 => insuff, then E is the answer.
Intern
Joined: 10 Jul 2009
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Re: Fun with Fractions [#permalink]  06 Aug 2009, 01:19
yezz wrote:
robertrdzak wrote:
In the fraction x/y, where x and y are positive integers, what is the value of y?

(1) the least common denominator of x/y and 1/3 is 6

(2) x = 1

from 1

y could be 2 or 6.......insuff

from 2

insuff

both
1/6 or 1/2........insuff.E

Sorry if my question sounds silly, but how do you calculate LCM for fractions? when i tried to instert 1/2 or 1/6 and 1/3 to an LCM calculator i did not get the result of 6.
Manager
Joined: 15 Jun 2009
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Kudos [?]: 27 [0], given: 8

Re: Fun with Fractions [#permalink]  06 Aug 2009, 02:11
tomirisk wrote:
yezz wrote:
robertrdzak wrote:
In the fraction x/y, where x and y are positive integers, what is the value of y?

(1) the least common denominator of x/y and 1/3 is 6

(2) x = 1

from 1

y could be 2 or 6.......insuff

from 2

insuff

both
1/6 or 1/2........insuff.E

Sorry if my question sounds silly, but how do you calculate LCM for fractions? when i tried to instert 1/2 or 1/6 and 1/3 to an LCM calculator i did not get the result of 6.

L.C.M. of fraction = L.CM of numerator/H.C.F of denominator ......Also note that L.CM * H.C.F =PRODUCT OF NUMBERS...

but in thsi question it was asked only least common denominator and not of whole fraction....2 & 3 L.C.M is 6 ...also 3 & 6 L.C.M is 6....
Manager
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Re: Fun with Fractions [#permalink]  06 Aug 2009, 02:23
tomirisk wrote:
yezz wrote:
robertrdzak wrote:
In the fraction x/y, where x and y are positive integers, what is the value of y?

(1) the least common denominator of x/y and 1/3 is 6

(2) x = 1

from 1

y could be 2 or 6.......insuff

from 2

insuff

both
1/6 or 1/2........insuff.E

Sorry if my question sounds silly, but how do you calculate LCM for fractions? when i tried to instert 1/2 or 1/6 and 1/3 to an LCM calculator i did not get the result of 6.

Also, L.C.M of 1/2 & 1/3 will be 1....As H.C.F of 2 & 3 ..is 1
Re: Fun with Fractions   [#permalink] 06 Aug 2009, 02:23
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