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# Is a positive?

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Math Expert
Joined: 02 Sep 2009
Posts: 52392

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09 Mar 2016, 11:51
00:00

Difficulty:

25% (medium)

Question Stats:

76% (01:09) correct 24% (01:23) wrong based on 47 sessions

### HideShow timer Statistics

Is a positive?

(1) a - b > 0
(2) 2a - b > 0

_________________
Intern
Joined: 03 Mar 2016
Posts: 15
Location: India
Schools: ISB '19

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09 Mar 2016, 22:52
a b
3 1
-1 -3
This shows a can be either +ve or -ve
VP
Joined: 05 Mar 2015
Posts: 1003

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11 Mar 2016, 09:35
Bunuel wrote:
Is a positive?

(1) a - b > 0
(2) 2a - b > 0

Picking no. is best solution
1. a-b>0

a=5: b=3.....yes
a=-1:b=-4....No.......insuff

2. 2a-b>0

a=5: b=1....Yes
a=-1/2 : b=-3....No........insuff

combining again
a=5: b=1....Yes
a=-1/2 : b=-3....No.......insuff

Ans E.
SVP
Joined: 26 Mar 2013
Posts: 2005

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30 Mar 2017, 03:56
Is a positive?

(1) a - b > 0

a-b>0...a>b

Let a = 1 & b=-100..........Answer is Yes

Let a =-1 & b=-100..........Answer is No

Insufficient

(2) 2a - b > 0

2a-b>0...2a>b

Let a = 1 & b=-100..........Answer is Yes

Let a =-1 & b=-100..........Answer is No

Combining 1 & 2, using same examples, it is still insufficient

Re: Is a positive? &nbs [#permalink] 30 Mar 2017, 03:56
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