Last visit was: 01 May 2026, 09:50 It is currently 01 May 2026, 09:50
Home
Messages
Tests
Schools
Events
Close
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

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
Sub 505 (Easy)|   Geometry|      
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 01 May 2026
Posts: 109,995
Own Kudos:
812,308
Given Kudos: 105,973
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,995
Kudos: 812,308
Lines AB and CD are parallel. What is x? 10 Feb 2021, 01:15
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

91% (00:49) correct 9% (01:38) wrong based on 85 sessions

History

Date
Time
Result
Not Attempted Yet

Lines AB and CD are parallel. What is x?

A. 100°

B. 110°

C. 105°

D. 120°

E. 130°



Project PS Butler


Subscribe to get Daily Email - Click Here | Subscribe via RSS - RSS


Show Spoiler
Attachment:
1.jpg
1.jpg [ 10.45 KiB | Viewed 2521 times ]
ShowHide Answer
Official Answer
B
User avatar
rajatchopra1994
User avatar
Joined: 16 Feb 2015
Last visit: 22 Jun 2024
Posts: 1,052
Own Kudos:
1,310
 [1]
Given Kudos: 30
Location: United States
Posts: 1,052
Kudos: 1,310
 [1]
Lines AB and CD are parallel. What is x? 10 Feb 2021, 06:55
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Explanation:

Angle x = 180 - 40 - 30
Angle x = 110

IMO-B
User avatar
mdsaddamforgmat
User avatar
Joined: 05 Dec 2019
Last visit: 20 Oct 2024
Posts: 108
Own Kudos:
158
 [1]
Given Kudos: 155
Location: Nepal
Schools: Tuck '23
GMAT 1: 420 Q33 V15
GMAT 2: 650 Q48 V31
GMAT 3: 640 Q47 V31
Schools: Tuck '23
GMAT 3: 640 Q47 V31
Posts: 108
Kudos: 158
 [1]
Lines AB and CD are parallel. What is x? 10 Feb 2021, 08:11
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
IMO B

Following alternate angle property, we get two angles are 30deg & 40deg
Therfore X = 180-30-40 =110 deg
avatar
TarunKumar1234
avatar
Joined: 14 Jul 2020
Last visit: 28 Feb 2024
Posts: 1,102
Own Kudos:
1,358
 [1]
Given Kudos: 351
Location: India
Posts: 1,102
Kudos: 1,358
 [1]
Lines AB and CD are parallel. What is x? 10 Feb 2021, 09:33
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Angle x = Angle opposite to it = 180- (180-140)-30 = 110

So, I think B. :)
User avatar
akadiyan
User avatar
Retired Moderator
Joined: 31 May 2017
Last visit: 20 Jun 2025
Posts: 724
Own Kudos:
706
 [1]
Given Kudos: 53
Concentration: Technology, Strategy
Schools: IIMA PGPX'23 Bayes Said '23
Products:
My Reviews
Schools: IIMA PGPX'23 Bayes Said '23
Posts: 724
Kudos: 706
 [1]
Lines AB and CD are parallel. What is x? 10 Feb 2021, 09:49
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
We have one of the angle = 40 , so we have one angle opposite to 40 is 180-40 = 140

We also have another angle which is 30, so based on alternative angle , we have 3rd angle as 30.
x = 180-40-30 = 110

Ans B
User avatar
kntombat
User avatar
Retired Moderator
Joined: 28 Feb 2020
Last visit: 19 Jan 2023
Posts: 861
Own Kudos:
530
Given Kudos: 839
Location: India
WE:Other (Other)
Posts: 861
Kudos: 530
Lines AB and CD are parallel. What is x? 11 Feb 2021, 01:18
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Angle BCD = \(30°\) (Alternate angles property).

Angle next to \(140°\) =\( 40°\)( Supplementary angles)

Angle x= \(180°- (40°+30°)\)

Angle X= \(110°\).

The OA is B.
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 39,015
Own Kudos:
1,122
Posts: 39,015
Kudos: 1,122
Lines AB and CD are parallel. What is x? 10 Mar 2022, 04:24
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Bunuel
Math Expert
109995 posts
Krunaal
Tuck School Moderator
852 posts