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by GMATGuruNY » Sat Jun 18, 2011 1:45 pm
The points A, B, C, and D are on a number line, not necessarily in that 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 drawings below satisfy both statements:
Image
Since in the first case BD=1 and in the second case BD=17, the two statements combined are insufficient.

The correct answer is E.
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by 1947 » Fri Sep 09, 2011 11:48 pm
What exactly is this question trying to test ?
And how can we solve this question in less than 2 or 3 minutes.
To consider all the scenarios I am taking a lot of time....
Please help on how to do this quickly.
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