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If |a – b| = c, what is the value of a?

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If |a – b| = c, what is the value of a?  [#permalink]

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New post 06 Nov 2016, 08:09
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

75% (00:48) correct 25% (00:49) wrong based on 152 sessions

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Re: If |a – b| = c, what is the value of a?  [#permalink]

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New post 06 Nov 2016, 10:46
6
Bunuel wrote:
If |a – b| = c, what is the value of a?

(1) b = 2
(2) c = 7


|a – b| = c
Opening the modulus implies a - b =c and -a+b=c
S1 gives only value of b, so not sufficient.
S2 gives only value of c, so not sufficient.
Combining both gives values of :
a = b+c =9
and a = b-c =-5, hence not sufficient, since we get two values.
Therefore, Ans. is E.

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Re: If |a – b| = c, what is the value of a?  [#permalink]

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New post 07 Nov 2016, 21:58
1)b value is given.. But without knowing c value we can't predict the value of a

2)Same as above. you have 3 unknows here.. Knowing only c value will not give any solution

If we combine we'll get b and c values but due to modifier we will get 2 values.

!a-2! = 7

-> a-2=7 and a-2= -7 so we are getting 2 values here. So answer is E
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Re: If |a – b| = c, what is the value of a?  [#permalink]

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New post 13 Sep 2018, 07:22
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If |a – b| = c, what is the value of a? &nbs [#permalink] 13 Sep 2018, 07:22
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