2) Let ACD=a
now if we extend AD to E, then CDE= 140
now CDE= y+a
So we get x+a=140
a is still unknown.
Trying to make mom and pop proud
- Rep Power
IMO answer is A
AC is the traversal cutting the parallel lines BC and AD
1. Alternate angles y=x=50.Hence sufficient
2. z=40 but value of y is unknown.Even though we know the exterior angle theorem that angle= angle y+ angle z, we are still helpless as value of angle y is known to find value of angle x. hence insufficient.
So answer is A.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By albema in forum GMAT Problem Solving
Last Post: 02-08-2012, 12:40 AM
By albema in forum GMAT Data Sufficiency
Last Post: 12-05-2008, 02:11 AM
By faust in forum GMAT Sentence Correction
Last Post: 06-17-2008, 07:18 AM
By gmat_boy in forum GMAT Critical Reasoning
Last Post: 08-05-2007, 05:27 AM
By whitelight in forum GMAT Problem Solving
Last Post: 05-04-2007, 07:53 AM
SEO by vBSEO ©2010, Crawlability, Inc.