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a < 0 < b so compare ab and a+b

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CEO
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a < 0 < b so compare ab and a+b [#permalink] New post 27 Oct 2016, 12:44
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A
B
C
D
E

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a < 0 < b

Quantity A
Quantity B
ab
a+b


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


Drill 2
Question: 13
Page: 288
[Reveal] Spoiler: OA

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1 KUDOS received
CEO
CEO
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Joined: 07 Jun 2014
Posts: 2549
GRE 1: 323 Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 41

Kudos [?]: 735 [1] , given: 127

Re: a < 0 < b so compare ab and a+b [#permalink] New post 27 Oct 2016, 12:47
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Explanation

Plug in values for a and b. If a = −2 and b = 2, then Quantity B is greater. Eliminate choices A and C. If \frac{1}{2} and b = \frac{1}{4}, then Quantity A is greater. Eliminate choice B.

Hence option D is correct.
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Re: a < 0 < b so compare ab and a+b [#permalink] New post 21 Jul 2017, 02:47
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I think the explanation is not properly written. Here it is given that a<0<b, then how can we assume the value of a as 1/2?
if we take a=-1 and b=1, then Column B is greater. Again if we take a=-1 and b=1/2, then both the columns are equal, i.e, Column C
So the answer will be D.
Plz verify if possible
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Re: a < 0 < b so compare ab and a+b [#permalink] New post 24 Jul 2017, 14:37
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sandy wrote:
a < 0 < b

Quantity A
Quantity B
ab
a+b




Given: a < 0 < b
So, a is NEGATIVE and b is POSITIVE

Let's test some values of a and b that satisfy the given information.

Let's first try a = -1 and b = 1
We get:
Quantity A: ab = (-1)(1) = -1
Quantity B: a+b = (-1) + 1 = 0
In this case, Quantity B is greater

Now try a = -2 and b = 0.5
We get:
Quantity A: ab = (-2)(0.5) = -1
Quantity B: a+b = (-2) + 0.5 = -1.5
In this case, Quantity A is greater

Answer: D

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Re: a < 0 < b so compare ab and a+b   [#permalink] 24 Jul 2017, 14:37
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