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QS 30 from Gmat Club test 18

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QS 30 from Gmat Club test 18 [#permalink] New post 14 Nov 2010, 07:20
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Is xy > x/y
1) 0<y<1
2) xy >1

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not

sufficient
Statement (2) ALONE is sufficient, but Statement (1) ALONE is not

sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is

sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient

Shouldn't the answer be B and not C ?

If xy> 1 ; then either x or y can't be 0, x or y can't be -ve. x & y can only be both negative or both are positive then xy > x/y. So B shpuld be sufficient
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Re: QS 30 from Gmat Club test 18 [#permalink] New post 14 Nov 2010, 08:12
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consider :
X=4 & Y= 1/2
xy = 2 & x/y= 8

x= 4 & y=2

xy = 8 & x/y=2

B is not sufficient.
Considering both statements together we get xy<x/y

Correct option C
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Re: QS 30 from Gmat Club test 18 [#permalink] New post 13 Dec 2011, 06:54
I disagree with answer C, for me it is answer A.

(1) 0<y<1 ---> xy > x/y if x=4 and y=0.5 xy= 2 and x/y= 4/ 5/10 = (4*10)/5 = 8 --> xy < x/y
if x=0.5 and y=0.2 xy=0.1 and x/y= 0.5/0.2 = 2.5 --> xy < x/y

So statement 1 ALONE is sufficient to answer the question.

(2) xy>1 ---> xy > x/y if x=1 and y=2 xy= 2 and x/y=1/2 ---> xy > x/y
if x=3 and y=0.5 xy= 1.5 and x/y=6 ----> xy < x/y

So statement 2 ALONE is NOT sufficient to answer the question.

Answer A is the right solution I think.
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Re: QS 30 from Gmat Club test 18 [#permalink] New post 13 Dec 2011, 10:09
andyhere4u wrote:
Is xy > x/y
1) 0<y<1
2) xy >1

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not

sufficient
Statement (2) ALONE is sufficient, but Statement (1) ALONE is not

sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is

sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient

Shouldn't the answer be B and not C ?

If xy> 1 ; then either x or y can't be 0, x or y can't be -ve. x & y can only be both negative or both are positive then xy > x/y. So B shpuld be sufficient


A alone is not sufficient as we don't know whether x is 0 or not.
B alone is not sufficient as we don't know if x>1 and 0<y<1 or x and y > 1
say x=4, y=0.5, xy=2>1, but x/y=8 xy<x/y
if x=4 and y=2, then xy=8, x/y=2 xy>x/y

A and B together, we know that x is not 0 and 0<y<1, is xy>x/y can definitely be answered.

hope this helps
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Re: QS 30 from Gmat Club test 18 [#permalink] New post 13 Dec 2011, 13:55
sanjuro9 wrote:
andyhere4u wrote:
Is xy > x/y
1) 0<y<1
2) xy >1

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not

sufficient
Statement (2) ALONE is sufficient, but Statement (1) ALONE is not

sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is

sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient

Shouldn't the answer be B and not C ?

If xy> 1 ; then either x or y can't be 0, x or y can't be -ve. x & y can only be both negative or both are positive then xy > x/y. So B shpuld be sufficient


A alone is not sufficient as we don't know whether x is 0 or not.
B alone is not sufficient as we don't know if x>1 and 0<y<1 or x and y > 1
say x=4, y=0.5, xy=2>1, but x/y=8 xy<x/y
if x=4 and y=2, then xy=8, x/y=2 xy>x/y

A and B together, we know that x is not 0 and 0<y<1, is xy>x/y can definitely be answered.

hope this helps


I completely forgot the 0...

Thank you !
Re: QS 30 from Gmat Club test 18   [#permalink] 13 Dec 2011, 13:55
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