It is currently 18 Nov 2017, 15:08

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

GMAT SET 19

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
B
Joined: 14 Jan 2006
Posts: 96

Kudos [?]: 40 [0], given: 2

Schools: HKUST
GMAT SET 19 [#permalink]

Show Tags

New post 23 Sep 2008, 13:52
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Please try this one
Attachments

untitled.JPG
untitled.JPG [ 116.09 KiB | Viewed 1216 times ]

Kudos [?]: 40 [0], given: 2

Senior Manager
Senior Manager
avatar
Joined: 18 Jun 2007
Posts: 285

Kudos [?]: 63 [0], given: 0

Re: GMAT SET 19 [#permalink]

Show Tags

New post 23 Sep 2008, 15:16
is 3x > 7y ?

St1 (x> y+4) suggests that 3x would be bigger than 7y only if y> 3
lets see why?
put x = y+4 into equation 3x > 7y
=> 3(y + 4)> 7y
=> 3y + 12 > 7y
=> 12 > 4y
=> 3 > y

you can check by putting values
St.1 insufficient

St2 tells us that 5x > 14 y
=> x is equal or bigger than 3y
=> if x is 3 y is 1
now put the values into equaltion 3x > 7y
x= 3, y= 1 => 3*3 > 7*1 ? ...........yes
x=9, y= 3 => 3*9 > 7*3 ?............yes

to me answer is B

Kudos [?]: 63 [0], given: 0

VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1402

Kudos [?]: 443 [0], given: 1

Re: GMAT SET 19 [#permalink]

Show Tags

New post 23 Sep 2008, 17:35
I am getting sufficicency in both cases but getting a N and Y . Either I must be wrong or the Q is wrong

Is 3x> 7y?

(1) says x-y > 4 and x, y both +ve

For any x, y values (1,6) (3,8) (4,8.5) (10,15) I got a N. Any thing I missed
(2) says -5x < -14y means 5x > 14 y -> x > 2.8y

If we substitute 2.81y for x in the given equation we see that 3x > 7y Y

Kudos [?]: 443 [0], given: 1

Manager
Manager
avatar
B
Joined: 14 Jan 2006
Posts: 96

Kudos [?]: 40 [0], given: 2

Schools: HKUST
Re: GMAT SET 19 [#permalink]

Show Tags

New post 23 Sep 2008, 17:37
any more takers ???

Kudos [?]: 40 [0], given: 2

Manager
Manager
avatar
B
Joined: 14 Jan 2006
Posts: 96

Kudos [?]: 40 [0], given: 2

Schools: HKUST
Re: GMAT SET 19 [#permalink]

Show Tags

New post 23 Sep 2008, 21:09
THE OA given is D...I think it should be B

Kudos [?]: 40 [0], given: 2

SVP
SVP
avatar
Joined: 17 Jun 2008
Posts: 1534

Kudos [?]: 280 [0], given: 0

Re: GMAT SET 19 [#permalink]

Show Tags

New post 25 Sep 2008, 12:49
icandy wrote:
I am getting sufficicency in both cases but getting a N and Y . Either I must be wrong or the Q is wrong

Is 3x> 7y?

(1) says x-y > 4 and x, y both +ve

For any x, y values (1,6) (3,8) (4,8.5) (10,15) I got a N. Any thing I missed
(2) says -5x < -14y means 5x > 14 y -> x > 2.8y

If we substitute 2.81y for x in the given equation we see that 3x > 7y Y


if x = 6 and y = 1 then 3x > 7y
But, if x = 15 and y = 10 then3x < 7y.

That is why, A cannot be sufficient.

Kudos [?]: 280 [0], given: 0

Retired Moderator
User avatar
B
Joined: 05 Jul 2006
Posts: 1749

Kudos [?]: 442 [0], given: 49

GMAT ToolKit User Premium Member
Re: GMAT SET 19 [#permalink]

Show Tags

New post 26 Sep 2008, 22:20
x,y are +ve

is 3x>7y

1) x> y+4
2)-5x<-14y

from one

substitute x for y+4

3(y+4) > 7y

3y+12>7y

12> 4y ie: 3>y substitute for y = 3 in the iniquality 1 , thus x >7

however y is a bit less than 3 and x a bit bigger than 7

thus 3(bit bigger than 7 ) > 7( a bit less than 3) ....suff

from 2

5x> 14y

2.5x> 7y

since x,y are positive then sure 3x>7y.......suff

D is my answer

Kudos [?]: 442 [0], given: 49

Re: GMAT SET 19   [#permalink] 26 Sep 2008, 22:20
Display posts from previous: Sort by

GMAT SET 19

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderator: chetan2u



GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.