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Each statement alone is clearly insufficient. When we consider them together, even if we say that A, D, and C are collinear, we can still have different answers. Look at the diagram below:

Attachment:

ADC.png [ 2.58 KiB | Viewed 2324 times ]

For the first case the answer is 13 miles and for the second case the answer is 7 miles.

Thanks for the explantion--you covered it well! You seem to be strong at math, which is probably why our practice questions doesn't look test like to you--you haven't seen ones of that low difficulty. But remember, the test is adaptive! Folks who are still early in their prep and struggling with their math scores will likely see easier problems than the ones you're used to until they refresh their math skills from high-school and start getting early questions consistently correct.

Thanks for the explantion--you covered it well! You seem to be strong at math, which is probably why our practice questions doesn't look test like to you--you haven't seen ones of that low difficulty. But remember, the test is adaptive! Folks who are still early in their prep and struggling with their math scores will likely see easier problems than the ones you're used to until they refresh their math skills from high-school and start getting early questions consistently correct.

Hope this helps!

Hi,

Well, I would say that the mentioned question is not an easy one, only due to the fact that there are many possibilities for position of A, B & C. If they were collinear there would be some restriction on the total number of cases.

i did this particular quest. and in 5 sec. chose 'c' - obviously wrong! i think more than i didn't understand the question, i hurried and on my part a silly mistake. i posted it more for the tricky part of it (atleast i felt so)!

thanx cyberjadugar for putting it right and for the link. it is always good to get direction and guidance. truly thanx, i learnt.

Thnx Mr. Eli n Thanx to Kaplan to give such brush ups for people like me. I mentioned Kaplan just and just to cite the importance of the question.

The first thing we should note is that the GMAT is tricky. It's natural to assume that A,B,C and D appear in the linear order they do in the alphabet. However, this isn't specified in the stem thus it cannot be assumed.

(1) A is 10 miles from D This tells us nothing about B. INSUFFICIENT

(2) C is 3 miles from D This tells us nothing about A. INSUFFICIENT

1+2)

There are two cases here:

(0mi) A=======C===D (10mi) In this case, C would be located 7mi away from A. OR A==========D===C In this case, C would be located 13mi away from A. INSUFFICIENT.

(E)

gmatclubot

Re: How far is A from C?
[#permalink]
01 Aug 2013, 14:45

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