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If ab ≠ 0, what is the value of (a+b)/(a-b)?

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If ab ≠ 0, what is the value of (a+b)/(a-b)? [#permalink]

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New post Updated on: 16 Mar 2017, 06:48
2
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A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

38% (00:57) correct 63% (00:51) wrong based on 48 sessions

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If ab ≠ 0, what is the value of \(\frac{a+b}{a-b}\) ?

(1) \(3a^2 = 2b^2\)
(2) b = 10

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Originally posted by godot53 on 16 Mar 2017, 02:15.
Last edited by Bunuel on 16 Mar 2017, 06:48, edited 1 time in total.
Renamed the topic and edited the question.
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If ab ≠ 0, what is the value of (a+b)/(a-b)? [#permalink]

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New post Updated on: 16 Mar 2017, 11:43
1
avik5503 wrote:
If ab ≠ 0, what is the value of \(\frac{a+b}{a-b}\) ?

(1) \(3a^2 = 2b^2\)
(2) b = 10



(1) multiply &divide by (a-b) to get
a^2-b^2/(a-b)^2

substitute a^2= 2b^2/3

2b^2/3-b^2 / (2b^2/3 +b^2 -2ab)

here we dont know whether b is >0 or <0
hence insuff

(2) clearly insuff

Combining we know b=10 (>0)

thus a = sqrt2/3 * b*b
thus a can be >0 or <0
insuff

Ans E

Originally posted by rohit8865 on 16 Mar 2017, 07:51.
Last edited by rohit8865 on 16 Mar 2017, 11:43, edited 2 times in total.
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Re: If ab ≠ 0, what is the value of (a+b)/(a-b)? [#permalink]

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New post 16 Mar 2017, 11:14
rohit8865 It can not be A.

The reason is that you will get a negative and positive number for statement 1

The answer is E
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Re: If ab ≠ 0, what is the value of (a+b)/(a-b)? [#permalink]

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New post 16 Mar 2017, 11:43
matthewsmith_89 wrote:
rohit8865 It can not be A.

The reason is that you will get a negative and positive number for statement 1

The answer is E



Good catch
edited!!!

thanks
Re: If ab ≠ 0, what is the value of (a+b)/(a-b)?   [#permalink] 16 Mar 2017, 11:43
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