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shebinjs: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Mon Sep 13, 2010 3:12 am

by shebinjs » Sat Apr 09, 2011 4:44 am

If -2x > 3y, is x negative?
1) y > 0
2) 2x + 5y - 20 = 0

How to analyse statement 2 for data sufficiency?

Thanks

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Source: Beat The GMAT — Data Sufficiency | Sat Apr 09, 2011 4:44 am

HSPA: Legendary Member; Posts: 1101; Joined: Fri Jan 28, 2011 7:26 amFollowed by: 13 members; Thanked: 47 times; GMAT Score:640

by HSPA » Sat Apr 09, 2011 4:54 am

A is sufficient

5y-20 = -2x

1) -2x= 4y
y = 20, x = -40; good
2) -2x = 6y
y = -20 x = +ve

Not sufficient..

IMO A

First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.

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pankajks2010: Master | Next Rank: 500 Posts; Posts: 118; Joined: Wed Mar 16, 2011 12:51 amFollowed by: 1 member; Location: New Delhi, India; Thanked: 12 times

by pankajks2010 » Sat Apr 09, 2011 5:02 am

shebinjs wrote:If -2x > 3y, is x negative?
1) y > 0
2) 2x + 5y - 20 = 0

How to analyse statement 2 for data sufficiency?

Thanks

Hi,

I think the answer is D
The given statement is -2x>3y --> (2x+3y)<0

Now statement 1 is simple to evaluate..Lets consider the second statement
2x+5y=20,
(2x+3y)+2y=20
Now, as seen above (2x+3y)<0, thus, 2y needs to be positive to satisfy the above equation. Thus, again y>0 and we can ascertain the nature of x.
Thus, statement 2 in a nutshell is again y>0

Answer is D

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manpsingh87: Master | Next Rank: 500 Posts; Posts: 436; Joined: Tue Feb 08, 2011 3:07 amFollowed by: 6 members; Thanked: 72 times

by manpsingh87 » Sat Apr 09, 2011 5:10 am

pankajks2010 wrote:
shebinjs wrote:If -2x > 3y, is x negative?
1) y > 0
2) 2x + 5y - 20 = 0

How to analyse statement 2 for data sufficiency?

Thanks
Hi,

I think the answer is D
The given statement is -2x>3y --> (2x+3y)<0

Now statement 1 is simple to evaluate..Lets consider the second statement
2x+5y=20,
(2x+3y)+2y=20
Now, as seen above (2x+3y)<0, thus, 2y needs to be positive to satisfy the above equation. Thus, again y>0 and we can ascertain the nature of x.
Thus, statement 2 in a nutshell is again y>0

Answer is D

2x+5y=20, now here different results are possible for different values of x and y,

for example consider y=-2, x become 15, and for y=2 x becomes 5, therefore 2 alone is not sufficient to answer the question..!! answer should be A

O Excellence... my search for you is on... you can be far.. but not beyond my reach!

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HSPA: Legendary Member; Posts: 1101; Joined: Fri Jan 28, 2011 7:26 amFollowed by: 13 members; Thanked: 47 times; GMAT Score:640

by HSPA » Sat Apr 09, 2011 5:10 am

Wow... I am with pankaj's solution

I always knew that if I make 1 quant mistake in gmat... 2000 desi guys will sit on my head.. (LOL only sentense)

First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.

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pankajks2010: Master | Next Rank: 500 Posts; Posts: 118; Joined: Wed Mar 16, 2011 12:51 amFollowed by: 1 member; Location: New Delhi, India; Thanked: 12 times

by pankajks2010 » Sat Apr 09, 2011 5:21 am

manpsingh87 wrote:
pankajks2010 wrote:
shebinjs wrote:If -2x > 3y, is x negative?
1) y > 0
2) 2x + 5y - 20 = 0

How to analyse statement 2 for data sufficiency?

Thanks
Hi,

I think the answer is D
The given statement is -2x>3y --> (2x+3y)<0

Now statement 1 is simple to evaluate..Lets consider the second statement
2x+5y=20,
(2x+3y)+2y=20
Now, as seen above (2x+3y)<0, thus, 2y needs to be positive to satisfy the above equation. Thus, again y>0 and we can ascertain the nature of x.
Thus, statement 2 in a nutshell is again y>0

Answer is D
2x+5y=20, now here different results are possible for different values of x and y,

for example consider y=-2, x become 15, and for y=2 x becomes 5, therefore 2 alone is not sufficient to answer the question..!! answer should be A

Hey Manp..Lets just test your assumptions on the given statement..ie; -2x>3y
1) y=-2 & x=15, this doesn't satisfies the condition
2) y=2 & x=5, neither this...

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manpsingh87: Master | Next Rank: 500 Posts; Posts: 436; Joined: Tue Feb 08, 2011 3:07 amFollowed by: 6 members; Thanked: 72 times

by manpsingh87 » Sat Apr 09, 2011 5:43 am

pankajks2010 wrote:
manpsingh87 wrote:
pankajks2010 wrote:
shebinjs wrote:If -2x > 3y, is x negative?
1) y > 0
2) 2x + 5y - 20 = 0

How to analyse statement 2 for data sufficiency?

Thanks
Hi,

I think the answer is D
The given statement is -2x>3y --> (2x+3y)<0

Now statement 1 is simple to evaluate..Lets consider the second statement
2x+5y=20,
(2x+3y)+2y=20
Now, as seen above (2x+3y)<0, thus, 2y needs to be positive to satisfy the above equation. Thus, again y>0 and we can ascertain the nature of x.
Thus, statement 2 in a nutshell is again y>0

Answer is D
2x+5y=20, now here different results are possible for different values of x and y,

for example consider y=-2, x become 15, and for y=2 x becomes 5, therefore 2 alone is not sufficient to answer the question..!! answer should be A
Hey Manp..Lets just test your assumptions on the given statement..ie; -2x>3y
1) y=-2 & x=15, this doesn't satisfies the condition
2) y=2 & x=5, neither this...

oops my bad i didn't check the initial condition, but then again that's the beauty of DS question, i should have paid more attention to the initial condition...!!!

O Excellence... my search for you is on... you can be far.. but not beyond my reach!

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shebinjs: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Mon Sep 13, 2010 3:12 am

by shebinjs » Sat Apr 09, 2011 5:12 pm

Many thanks guys .... Answer is D and I got it ...

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force5: Legendary Member; Posts: 582; Joined: Tue Mar 08, 2011 12:48 amFollowed by: 6 members; Thanked: 61 times; GMAT Score:740

by force5 » Mon Apr 11, 2011 6:01 am

Solved the best way. D it is..

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coolly01: Junior | Next Rank: 30 Posts; Posts: 29; Joined: Sun Feb 20, 2011 11:03 pm

by coolly01 » Wed Apr 13, 2011 3:15 am

shebinjs wrote:If -2x > 3y, is x negative?
1) y > 0
2) 2x + 5y - 20 = 0

How to analyse statement 2 for data sufficiency?

Thanks

IMO : A
1. it's clear that 3y > 0, in order that -2x > 0 => x < 0
=> SUFFICIENT
2. 2x + 5y = 20
if y > 4, x <0
if y < 4, x > 0
=> INSUFFICIENT

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coolly01: Junior | Next Rank: 30 Posts; Posts: 29; Joined: Sun Feb 20, 2011 11:03 pm

by coolly01 » Wed Apr 13, 2011 3:27 am

OH, I forgot the condition
Thanks all

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