Gmat prep Q3

Here is how you solve this

Angle ABC (of the large triangle) = 180 - 3x. This is because angle BAC is x and angle ACB is 2x. So these two add up 3x and the other angle is 180-3x

Angle DBC is 180 - 4x. This is the angle of isoceles triangle DBC.

If you subtract the two angles above to find angle ABD, you find that
180 - 3x - (180 - 4x) = x
So angle ABD is x.

If this is so, then triangle ABD is isoceles as well, and the side AD = DB

No statement 1.

You are given that AD = 6. So BD will also = 6. And since triangle DBC is isoceles as well, then BC = 6.

SUFFICIENT

Statement 2 gives you nothing, only gives you angle measures that don't help you calculate segment distances. Beware of this trap.

Quote

Post new topic Post Reply

• Page 1 of 1

5/5

5 Star (473 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