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# Points on a line

Author Message
TAGS:
Director
Status: Preparing for the 4th time -:(
Joined: 25 Jun 2011
Posts: 548
Location: United Kingdom
GMAT Date: 06-22-2012
GPA: 2.9
WE: Information Technology (Consulting)
Followers: 10

Kudos [?]: 149 [0], given: 215

Points on a line [#permalink]  12 Dec 2011, 05:56
00:00

Difficulty:

5% (low)

Question Stats:

85% (02:44) correct 14% (00:02) wrong based on 7 sessions
The point A, B, C, and D are on the number line, not necessarily in the order. If the distance between A and B is 18 and the distance between C and D is 8, what is the distance between B and D?
1). The distance between C and A is the same as the distance between C and B.
2). A is to the left of D on the number line.

The answer is E. Any idea how come?
[Reveal] Spoiler: OA

_________________

Best Regards,
E.

MGMAT 1 --> 530
MGMAT 2--> 640
MGMAT 3 ---> 610

Manager
Joined: 29 Jul 2011
Posts: 112
Location: United States
Followers: 2

Kudos [?]: 28 [0], given: 6

Re: Points on a line [#permalink]  12 Dec 2011, 17:57
ABCD can be arranged in any order on the number line, the question stem does not has enough information to rephrase. So, lets move to statements.

1. C is between A and B. There are four sequences possible here: ACDB, ADCB, BCDA, and BDCA. All cases has different distances (2 pairs) between B and D. INSUFFICIENT
2. A is to the left of D. Where is D w.r.t B? INSUFFICIENT

Together, we have ACDB or ADCB as the sequence, both with different distances between B and D. INSUFFICIENT.

E.
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Intern
Joined: 25 Oct 2011
Posts: 3
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Kudos [?]: 0 [0], given: 0

Re: Points on a line [#permalink]  14 Dec 2011, 05:43
If you draw a number line and plot points ABCD on it, then you will realise that -

1) B can be between A and C
2) C can be between A and B

The above 2 variations is sufficient to prove that the answer is E.
Re: Points on a line   [#permalink] 14 Dec 2011, 05:43
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