Can anyone explain this answer?

Expert replies

Previous Topic Next Topic

madsport: Senior | Next Rank: 100 Posts; Posts: 46; Joined: Mon Aug 25, 2008 9:06 am; Thanked: 1 times

by madsport » Tue Sep 09, 2008 9:51 am

The answer is E

Attachments

Like this post

Source: Beat The GMAT — Data Sufficiency | Tue Sep 09, 2008 9:51 am

mlane25269: Master | Next Rank: 500 Posts; Posts: 151; Joined: Fri Jun 13, 2008 7:31 am; Thanked: 1 times

by mlane25269 » Tue Sep 09, 2008 10:05 am

Hi Madsport!

Statement 1 only gives us the length of AC

Statement 2 only gives the length of BD

Since there is no information about the length of BC and because we can NEVER assume that lines or figures are drawn to scale in data sufficiency questions, there is no way for us to find the length of BC and thus length of line AD.

Like this post

canuckclint: Master | Next Rank: 500 Posts; Posts: 154; Joined: Tue Aug 26, 2008 12:59 pm; Location: Canada; Thanked: 4 times

by canuckclint » Thu Sep 11, 2008 10:23 pm

Divide the segments into x, y, and z, three parts, we want total t

Then x + y + z = t

1. x+ y =6
2. y + z = 6

3 equattions 4 unknowns x,y,z and t, impossible to solve,
PS. we can get rid of y by subtracting the eqautions.

4. x - z = 0
We could get x = z, but when we plug into 1., we get 2 back:
z + y = 6.

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review