x > y

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GmatKiss: Legendary Member; Posts: 2789; Joined: Tue Jul 26, 2011 12:19 amFollowed by: 43 members; Location: Chennai, India; Thanked: 206 times; GMAT Score:640

by GmatKiss » Sat Oct 22, 2011 1:03 pm

Is x > y ?

(1) ax > ay
(2) a^2 . x > a^2 . y

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Source: Beat The GMAT — Data Sufficiency | Sat Oct 22, 2011 1:03 pm

neelgandham: Community Manager; Posts: 1060; Joined: Fri May 13, 2011 6:46 amFollowed by: 52 members; Location: Utrecht, The Netherlands; Thanked: 318 times

by neelgandham » Sat Oct 22, 2011 1:37 pm

Is x > y ?

(1) ax > ay

if a > 0, we can answer the question Is x > y ? YES
if a < 0, we can answer the question Is x > y ? NO
if a = 0, we cannot answer the question Is x > y ? ??

Insufficient

(2) a^2 . x > a^2 . y

if a > 0, we can answer the question Is x > y ? YES
if a < 0, we can answer the question Is x > y ? YES
if a = 0, we cannot answer the question Is x > y ? ??

Insufficient

Option E

Anil Gandham
Welcome to BEATtheGMAT | Photography | Getting Started | BTG Community rules | MBA Watch
Check out GMAT Prep Now's online course at https://www.gmatprepnow.com/

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pemdas: Legendary Member; Posts: 1084; Joined: Fri Apr 15, 2011 2:33 pmFollowed by: 21 members; Thanked: 158 times

by pemdas » Sat Oct 22, 2011 1:48 pm

agree with st(1) inequality switches signs depending on a +ve or -ve but disagree about st(2)
st(2) should be sufficient as the given condition is ">" and not "=" for 0 on both sides

b

neelgandham wrote:Is x > y ?

(1) ax > ay

if a > 0, we can answer the question Is x > y ? YES
if a < 0, we can answer the question Is x > y ? NO
if a = 0, we cannot answer the question Is x > y ? ??

Insufficient

(2) a^2 . x > a^2 . y

if a > 0, we can answer the question Is x > y ? YES
if a < 0, we can answer the question Is x > y ? YES
if a = 0, we cannot answer the question Is x > y ? ??

Insufficient

Option E

Success doesn't come overnight!

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neelgandham: Community Manager; Posts: 1060; Joined: Fri May 13, 2011 6:46 amFollowed by: 52 members; Location: Utrecht, The Netherlands; Thanked: 318 times

by neelgandham » Sat Oct 22, 2011 2:09 pm

Thanks for correcting me Pemdas !

pemdas wrote:agree with st(1) inequality switches signs depending on a +ve or -ve but disagree about st(2)
st(2) should be sufficient as the given condition is ">" and not "=" for 0 on both sides

b
neelgandham wrote:Is x > y ?

(1) ax > ay

if a > 0, we can answer the question Is x > y ? YES
if a < 0, we can answer the question Is x > y ? NO
if a = 0, we cannot answer the question Is x > y ? ??

Insufficient

(2) a^2 . x > a^2 . y

if a > 0, we can answer the question Is x > y ? YES
if a < 0, we can answer the question Is x > y ? YES
if a = 0, we cannot answer the question Is x > y ? ??

Insufficient

Option E

Anil Gandham
Welcome to BEATtheGMAT | Photography | Getting Started | BTG Community rules | MBA Watch
Check out GMAT Prep Now's online course at https://www.gmatprepnow.com/

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smackmartine: Legendary Member; Posts: 516; Joined: Fri Jul 31, 2009 3:22 pmFollowed by: 13 members; Thanked: 112 times

by smackmartine » Sat Oct 22, 2011 10:48 pm

IMO B

(1) ax > ay

a(x-y)>0 (a and (x-y) have same signs , but we don't know + or -ve so Insuff )

(2) a^2 . x > a^2 . y

a^2(x-y)> 0

we know that a^2 is positive , so x-y > 0 --> x>y (suff)

Smack is Back ...
It takes time and effort to explain, so if my comment helped you please press Thanks button

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mankey: Legendary Member; Posts: 627; Joined: Thu Jun 23, 2011 9:12 amFollowed by: 1 member; Thanked: 4 times

by mankey » Sun Oct 23, 2011 10:38 am

Is the OA "B"?

Thanks.

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mankey: Legendary Member; Posts: 627; Joined: Thu Jun 23, 2011 9:12 amFollowed by: 1 member; Thanked: 4 times

by mankey » Mon Oct 24, 2011 9:58 am

Someone please provide OA.

Thanks.

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