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If x and y are positive, is 4x > 3y? (1) x > y - x (2)

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Director
Joined: 01 Apr 2008
Posts: 881
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
If x and y are positive, is 4x > 3y? (1) x > y - x (2) [#permalink]

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22 Mar 2009, 23:22
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If x and y are positive, is 4x > 3y?
(1) x > y - x
(2) x/y < 1
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Director
Joined: 14 Aug 2007
Posts: 728
Re: DS: Inequality [#permalink]

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23 Mar 2009, 01:39
E.
Attachment:

inq2.JPG [ 10.6 KiB | Viewed 894 times ]
Senior Manager
Joined: 06 Jul 2007
Posts: 274
Re: DS: Inequality [#permalink]

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23 Mar 2009, 08:45
Economist wrote:
If x and y are positive, is 4x > 3y?
(1) x > y - x
(2) x/y < 1
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

those who find it difficult to use the graphical method, here is an alternative :

Fact 1: x > y -x

=> x = y -x +k where k is a positive number

2x = k+y
4x = 2k + 2y

depending upon k, 4x may or may not be greater than 3y

Fact 2: x < y

=> x+h = y

4x = 4y -4h

depending upon h, 4x may or may not b greater than 3y

combining both Fact 1 and Fact 2 together :

2k + 2y = 4y - 4h
y = k + 2h
=> 3y = 3k + 6h and 4x = 4k + 4h

again we are not sure whether 4x > 3y because we don't know the values of h and k.

Hence E.
Re: DS: Inequality   [#permalink] 23 Mar 2009, 08:45
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If x and y are positive, is 4x > 3y? (1) x > y - x (2)

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