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A and B are 18 apart. C is smack in the middle, and D is 8 from the middle, but couldn't it be on either side? so it could be 1 away from D and also 17 away from D, depending on whether C or D is larger, which I don't think it indicates.
Let me know if I'm overlooking something here. I've been on a roll of careless errors, so I could be wrong big time.
Re: DS: number line [#permalink]
17 Nov 2005, 18:08
I got C as well but bd = 17 from statement 1) CA = CB = 9 but we have no idea where D is located from statmetn 2 we know that A is left of D. again this is not sufficient. if we put them together, we get BD = BC + CD = 9 + 8 = 17. so answer is C.
hey ram.... ......
let me change the OA because i assumed CD= 18. it should be E. because D can in between A and C and C and B.
if it is between A and C, BD=17
if it is between B and C, BD=1
Re: Points on a line [#permalink]
12 Dec 2011, 17:57
This post received KUDOS
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.
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DS - If negative answer only, still sufficient. No need to find exact solution. PS - Always look at the answers first CR - Read the question stem first, hunt for conclusion SC - Meaning first, Grammar second RC - Mentally connect paragraphs as you proceed. Short = 2min, Long = 3-4 min
Re: The point A, B, C, and D are on the number line, not necessa [#permalink]
06 Dec 2013, 11:16
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.
Here is my take.
(1) we know that CA=CB and that the distance between A and B = 18 so A is at 0, C is at 9 and B is at 18 with CA=CB=9. Because C is in the middle, D has to lie somewhere between A and B, 8 units away, specifically at 1 or 17 (9-8 or 9+8) The difference between B and D, therefore, could be 18-17 or 18-1. Insufficient.
(2) This tells us very little, especially considering that the stem gives us no order in which A,B,C,D can be placed. A could be at 1 and D at 2 or D at 1000. Insufficient.
(1+2) (2), when taken into consideration with (1) provides us no new information. From (1) we already know that D lies to the right of A. All we know is that it could be 1 away from A or 17 away from A.