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the points A, B,C,D..

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by clock60 » Wed Jul 06, 2011 11:21 am
hi guys,
tried to seek this one, but failed. Does any efficient way exist to solve below problem?

if points A,B,C,D are on the number line not necessary in that order,and 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 distance between C and B
(2)A is to the left of D on the number line
oa is E
thanks
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Source: — Data Sufficiency |
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by Frankenstein » Wed Jul 06, 2011 12:16 pm
Hi,
From(1):
C is the mid point of AB
Possibilities:
A--D------C----------B
A---------C-------D--B
B--D------C----------A
A---------C-------D--B
Not sufficient
From(2): Many possibilities
Both(1) and (2):
A--D------C----------B
A---------C-------D--B
Not sufficient

Hence, E
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by GMATGuruNY » Wed Jul 06, 2011 12:37 pm
I answered this question here:

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by clock60 » Wed Jul 06, 2011 12:46 pm
thanks to both
Great reply
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by mirantdon » Thu Jul 07, 2011 9:49 am
+1 for e.
A--C--D-B-
OR
A--C-B-D

CAN T SAY using both the statements
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by amit2k9 » Mon Jul 18, 2011 10:46 pm
|A| - |B| = 18
|C|- |D| = 8
|A| - |D| = ?

-------A-|D1--------C--------|D2-B
combining a and b,

D can be either of the two points D1 or D2 at a distance of 8 from C.
hence E it is.
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