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Is a > b ? (1) |a|/|b| > 1 (2) |a - b| < |a|

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Is a > b ? (1) |a|/|b| > 1 (2) |a - b| < |a| [#permalink]

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New post Updated on: 23 Dec 2017, 06:40
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

63% (02:39) correct 37% (01:23) wrong based on 27 sessions

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Is a > b ?

(1) |a|/|b| > 1

(2) |a - b| < |a|

Source: http://www.GMATinsight.com
[Reveal] Spoiler: OA

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Originally posted by GMATinsight on 23 Dec 2017, 05:57.
Last edited by Bunuel on 23 Dec 2017, 06:40, edited 1 time in total.
Renamed the topic, edited the question
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Re: Is a > b ? (1) |a|/|b| > 1 (2) |a - b| < |a| [#permalink]

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New post 23 Dec 2017, 07:07
GMATinsight wrote:
Is a > b ?

(1) |a|/|b| > 1

(2) |a - b| < |a|

Source: http://www.GMATinsight.com



(1) \(\frac{|a|}{|b|} > 1\).......
It tells us that the numeric value of a is MORE than that of b..
so if a is -ive .... ans is NO as a<b
if a is +ive..... ans is YES as a>b
insuff

(2) |a - b| < |a|
square both sides
\(a^2-2ab+b^2<a^2....................b(b-2a)<0\)
so both b and b-2a are of OPPOSITE sign
if b>0, b-2a<0 or b<2a, so a>0
if b<0, b-2a>0 or b>2a, so a<0
so nothing much except BOTH are of same sign
insuff

combined
both are positive a>b... yes
both are -ive, a<b... no
insuff

E
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Re: Is a > b ? (1) |a|/|b| > 1 (2) |a - b| < |a| [#permalink]

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New post 23 Dec 2017, 08:09
GMATinsight wrote:
Is a > b ?

(1) |a|/|b| > 1

(2) |a - b| < |a|

Source: http://www.GMATinsight.com


Answer E

1. It is insufficient, since |a|>|B| doesn't mean that a>b
2. Use a=-2 b=-3 we get 1<2 -- true --a>b
and a=2 b=3 we get 1<2 --true --a<b

Both 1 and 2. use a=-3 b=-2 we get 1<3 --true --a<b
and a=3 b=2 we get 1<3 --true --a>b

thus insufficient
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Re: Is a > b ? (1) |a|/|b| > 1 (2) |a - b| < |a|   [#permalink] 23 Dec 2017, 08:09
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