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# DS: Lines (GMATPrep)

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Manager
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18 Jun 2006, 13:49
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VP
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18 Jun 2006, 16:11
A. if x>y, line (pq) with higher adjcent angle (x) is shorter than the line (sr) with smaller adj angle (y).

st 2 says x+y > 90. in this case, either could be greater than the another.

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Manager
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18 Jun 2006, 16:27
MA wrote:
A. if x>y, line (pq) with higher adjcent angle (x) is shorter than the line (sr) with smaller adj angle (y).

st 2 says x+y > 90. in this case, either could be greater than the another.

that's what I thought but the OA is E. strange....

anyone else, maybe we're missing something....

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Intern
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18 Jun 2006, 16:36
I also think the answer is (A), but if OA is (E), the reason would be the situation where y=0?

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18 Jun 2006, 16:46
mrmikec wrote:
MA wrote:
A. if x>y, line (pq) with higher adjcent angle (x) is shorter than the line (sr) with smaller adj angle (y).

st 2 says x+y > 90. in this case, either could be greater than the another.

that's what I thought but the OA is E. strange....

anyone else, maybe we're missing something....

guys, help on this one.

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Director
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18 Jun 2006, 18:59
A should be sufficient...OA seems to be incorrect.
I have found other mistakes on Gmatprep, so I'm not surprised
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18 Jun 2006, 19:06
A it is. y < x => PQ < SR SUFF.
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18 Jun 2006, 19:06
Should be A. Statement 2 could mean different values of x and y.

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Manager
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19 Jun 2006, 04:43
I would go with A too. Seems like GMATPrep has a few incorrect answers. Found 1 in the verbal section also.

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19 Jun 2006, 05:51
A. S1 is sufficient.

Given two parallel line and an intercepting line, the intercept length is inversely proportional to the angle between the lines i.e smaller the angle the greater the length (provided angle < 90)

S1. x > y => PQ < SR Sufficient.
S2. x+y > 90, we still don't know x,y separately.

Therefore A.

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19 Jun 2006, 06:35
A is not sufficient. Imagine y=45 and x=170. Which one is longer now?

When there is a graph in the test, remember to be very careful about not to assume additional conditions based on the graph shown.
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19 Jun 2006, 07:41
HongHu wrote:
A is not sufficient. Imagine y=45 and x=170. Which one is longer now?

When there is a graph in the test, remember to be very careful about not to assume additional conditions based on the graph shown.

But the stem specifically says that X and Y are both less than 90. Unless this is a tricky GMATPrep play on words, then by the basic laws of Geometry Statement 1 has to be sufficient.

(A)

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19 Jun 2006, 07:46
How could the one and only authoritative Official Guide published by GMAC make such a mistake? I`m flummoxed

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19 Jun 2006, 08:31
Oh, you are right. It is I who has not read the questions carefully.
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Director
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19 Jun 2006, 08:50
mrmikec wrote:

E.

This is why

Let's take (A),
X > Y means nothing, for e.g. if X = 135 and y = 45, then the line segments are equal. The length will contract and expand from one side of the 90 deg to the other. So if we draw a perpendicular line (i.e. assume x = 90, then the lengths are same for each degree either side). Not useful.

Take (B), as in case (A), X+Y>90 means nothing, as there are many possible variations with either PQ=SR or greater or lesser.

Neither is sufficient, so it's E.

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19 Jun 2006, 08:54
You made the same mistake as I did, buddy.
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05 Aug 2006, 17:46
OA is A..

I just have the picture from the GMAT Prep exam I took:
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Manager
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05 Aug 2006, 18:30
Does it mean they fixed the error in GMAtPrep software between the time the question was originally posted and now? So they too make mistakes...

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05 Aug 2006, 18:30
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