Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 02 Jul 2015, 22:39

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Are X & Y both positive?

Author Message
TAGS:
Intern
Joined: 01 May 2006
Posts: 18
Followers: 0

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

Are X & Y both positive? [#permalink]  30 Apr 2007, 19:53
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
POST EDITED...Second statement has been corrected

Hi ..Need help in solving this DS :
---------------------------------------
Are X & Y both positive

(1) 2x-2y = 1
(2) x/y > 1 (X divided by Y)

Last edited by hellofriends on 02 May 2007, 16:49, edited 1 time in total.
Director
Joined: 26 Feb 2006
Posts: 905
Followers: 4

Kudos [?]: 58 [0], given: 0

Re: DS-GMAT Prep [#permalink]  30 Apr 2007, 21:38
hellofriends wrote:
Hi ..Need help in solving this DS :
---------------------------------------
Are X & Y both positive

(1) 2x-2y = 1
(2) x/y=1 (X divided by Y)

look for similar question though i missed it.

http://www.gmatclub.com/phpbb/viewtopic ... ht=#316336
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5068
Location: Singapore
Followers: 23

Kudos [?]: 193 [0], given: 0

St1:
x-y = 1/2

x can be 0 and y = -1/2 or x = 1/4 and y = 1/4 etc

Insufficient.

St2:
x/y = 1
x = y

Can be both positive or both negative

Using both, sufficient. Both must be positive.

Ans C
Manager
Joined: 04 Oct 2006
Posts: 78
Followers: 1

Kudos [?]: 15 [0], given: 0

Re: DS-GMAT Prep [#permalink]  01 May 2007, 02:05
hellofriends wrote:
Hi ..Need help in solving this DS :
---------------------------------------
Are X & Y both positive

(1) 2x-2y = 1
(2) x/y=1 (X divided by Y)

(1) not sufficient because at least both negative or both positive

(2) not sufficient because both negative or both positive

(1) and (2) give 2x-2x=1

Manager
Joined: 11 Nov 2006
Posts: 144
Followers: 1

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

[quote="ywilfred"]St1:
x-y = 1/2

x can be 0 and y = -1/2 or x = 1/4 and y = 1/4 etc

Insufficient.

St2:
x/y = 1
x = y

Can be both positive or both negative

Using both, sufficient. Both must be positive.

Ans C[/quote]

Hi ywilfred, I don't get the answer of this question... When we analyze statements 1&2, the information we have is of 2 lines that never intersect (slope is 1 in both cases), therefore there is not solution! Could you please elaborate?
Senior Manager
Joined: 24 Nov 2006
Posts: 351
Followers: 1

Kudos [?]: 16 [0], given: 0

Re: DS-GMAT Prep [#permalink]  01 May 2007, 09:21
(1) x = y + 1/2
(2) x = y

Clearly, for (1) or (2), one cannot state for sure that x and y are both +ve.

For (1&2), we get an unsolvable set of 2 equations w/ 2 variables (the expressions with x and y have the same coefficients).

Then, E.
Director
Joined: 18 Jul 2006
Posts: 531
Followers: 1

Kudos [?]: 31 [0], given: 0

Re: DS-GMAT Prep [#permalink]  01 May 2007, 09:51
F75 wrote:
hellofriends wrote:
Hi ..Need help in solving this DS :
---------------------------------------
Are X & Y both positive

(1) 2x-2y = 1
(2) x/y=1 (X divided by Y)

(1) not sufficient because at least both negative or both positive

(2) not sufficient because both negative or both positive

(1) and (2) give 2x-2x=1

Agree E.
If (2) x/y >1, then answer would be C.
Intern
Joined: 01 May 2006
Posts: 18
Followers: 0

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

the OA for this question is "C".Both of the Conditions together are sufficient..
Manager
Joined: 11 Nov 2006
Posts: 144
Followers: 1

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

[quote="hellofriends"]the OA for this question is "C".Both of the Conditions together are sufficient..[/quote]
Can you check then whether you have written the statement 2 correctly?
The answer is clearly E... we have two parallel lines, meaning that there is no solution! In addition, if x=y you can never get the solution x/2-y/2=1
Intern
Joined: 30 Nov 2006
Posts: 20
Followers: 0

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

Ans E
(1) 2x-2y=1 >> x-y=0.5 >> x is +ve, but can't say about y (It can be either). NOT SUFFICIENT
(2) x/y > 1 >> both can be -ve or +ve, also implies that x>y. But cant say for sure if both are +ve. Hence NOT SUFFICIENT
(3) Together: x>0 and x>y; still cant say about y. Hence NOT SUFFICIENT

Hence E
Similar topics Replies Last post
Similar
Topics:
5 Are x and y both positive? 9 29 Jan 2009, 05:21
are x and y both positive? 5 09 Jul 2007, 10:24
2 Are x and y both positive? 25 02 Oct 2006, 20:25
1 Are x and y both positive? 30 08 Jun 2006, 17:24
Are x and y both positive? 6 21 May 2006, 10:48
Display posts from previous: Sort by