GMAT prep 1 DS question

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prasantnaidu: Senior | Next Rank: 100 Posts; Posts: 31; Joined: Tue Aug 19, 2008 11:06 pm; Location: India; Thanked: 1 times; GMAT Score:440

GMAT prep 1 DS question

by prasantnaidu » Mon Apr 06, 2009 11:56 am

Hi All,
I did a search to find answer to this DS problem but failed.
Please have a look and let me know how can be Statement 1/'A' be the correct choice.

Cheerio,
Prasant

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Source: Beat The GMAT — Data Sufficiency | Mon Apr 06, 2009 11:56 am

Musiq: Senior | Next Rank: 100 Posts; Posts: 93; Joined: Thu Apr 10, 2008 1:42 pm; Location: Chicago; Thanked: 20 times

by Musiq » Mon Apr 06, 2009 12:30 pm

A transversal is a line that connects 2 parallel lines.
If 2 transversals make the same angle with the parallel lines, then the lengths of the transversals are the same.The smaller angle will have the larger transversal.

A great analogy would be the following:

Imagine that a boat is trying to cross the parallel banks of the River Ganges. The boat's trajectory is your transversal.

Which angle (made with the bank of course) gives us the shortest route???
90 degrees...or straight ahead, would be the shortest route.

Now if a different boat went on a 60 degree trajectory, it would have to travel a longer distance to reach the other bank.

Hence, Statement I is sufficient to answer the given question.

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Ossa: GMAT Instructor; Posts: 30; Joined: Sun Oct 26, 2008 5:42 pm; Thanked: 5 times

Re: GMAT prep 1 DS question

by Ossa » Mon Apr 06, 2009 3:17 pm

The difference between the angles x, and y is the key as Musiq showed. The second statement is irrelevant because it does not show the relationship between the two angles, but the first statement does.

prasantnaidu wrote:Hi All,
I did a search to find answer to this DS problem but failed.
Please have a look and let me know how can be Statement 1/'A' be the correct choice.

Cheerio,
Prasant

Ossa Elhadary, PhD, CISA, PMP
Math Specialist
Test Prep New York
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