|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
AccipiterQ
GMAT 2: 730 Q49 V41
Posts: 144
Updated on: 21 Oct 2013, 08:50
Originally posted by AccipiterQ on 21 Oct 2013, 08:15.
Last edited by Bunuel on 21 Oct 2013, 08:50, edited 1 time in total.
Last edited by Bunuel on 21 Oct 2013, 08:50, edited 1 time in total.
Edited the question.
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
81% (01:55) correct
19%
(02:08)
wrong
based on 319
sessions
History
Date
Time
Result
Not Attempted Yet
Attachment:
crisscross.jpg [ 34.28 KiB | Viewed 13070 times ]
A) 30
B) 50
C) 55
D) 65
E) 90
AccipiterQ
21 Oct 2013, 08:35
Kudos
Bookmarks
here's my question:
I solved it by taking 2a+5a+5=180, and solving for a, and then taking 2b-10+4b+10=180, and solving for b. I end up with b=30, and a=25.
But I also thought, since the angles 2a and 2b-10 are opposite, they have to add to 180, yes? so why doesnt 2a+2b-10=180 also yield the correct answer; in this case you would get:
2a+2b-10=180
2a+2b=190
a+b=95
I solved it by taking 2a+5a+5=180, and solving for a, and then taking 2b-10+4b+10=180, and solving for b. I end up with b=30, and a=25.
But I also thought, since the angles 2a and 2b-10 are opposite, they have to add to 180, yes? so why doesnt 2a+2b-10=180 also yield the correct answer; in this case you would get:
2a+2b-10=180
2a+2b=190
a+b=95
21 Oct 2013, 09:09
Kudos
Bookmarks
AccipiterQ
No. 2a and 2b-10 are opposite angles. Opposite angles are equal.
Attachment:
Vertical_Angles.svg.png [ 4.87 KiB | Viewed 11576 times ]
