NEW HERE? LEARN MORE
closeclose
It is currently 18 Apr 2024, 08:30
Register
GMAT Focus Tests
Decision Tracker
My Rewards
New posts
New comers' posts

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

What is the value of x?

9 posts Go to First Unread Post
Print view
NEW TOPIC
POST REPLY
Question banks

GMAT Question Banks

Downloads
My Bookmarks
Reviews
SORT BY:
Date
Kudos
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92747
CAT Tests Forum Quiz Mode
What is the value of x? [#permalink] New post  28 Oct 2014, 08:23
4
Kudos
38
Bookmarks
Expert Reply
00:00
A
B
C
D
E

Difficulty:

35% (medium)

Question Stats:

61% (01:03) correct 39% (00:56) wrong based on 819 sessions
Hide Show timer Statistics

Tough and Tricky questions: Coordinate Geometry.





(1) l1 is parallel to l2
(2) y = 70

Show Spoiler
Attachment:
untitled.GIF
untitled.GIF [ 2.97 KiB | Viewed 17858 times ]
ShowHide Answer
Official Answer
Official Answer and Stats are available only to registered users. Register/Login.

_________________
New to the GMAT CLUB Forum?

My Signature Questions' Collection:


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics
Signature Read More
request expert reply
Most Helpful Reply
User avatar
L
BrentGMATPrepNow
GMAT Club Legend
GMAT Club Legend
Joined: 12 Sep 2015
Posts: 6825
Location: Canada
What is the value of x? [#permalink] New post  Updated on: 04 Feb 2023, 09:45
1
Kudos
7
Bookmarks
Expert Reply
Top Contributor
Bunuel wrote:

Tough and Tricky questions: Coordinate Geometry.



Attachment:
untitled.GIF
What is the value of x?

(1) l1 is parallel to l2
(2) y = 70


Target question: What is the value of x?

IMPORTANT: For geometry Data Sufficiency questions, we are typically checking to see whether the statements "lock" a particular angle, length, or shape into having just one possible measurement. This concept is discussed in much greater detail in the video below.

Notice that neither statement affects the placement of line3

So, let's jump straight to....
Statements 1 and 2 combined
Consider the following two diagrams that both satisfy the conditions in statements 1 AND 2.




Notice that, each time we move line3, the value of x changes.
So, there's no way to determine (i.e., lock in) the value of x
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

Answer: E

RELATED VIDEOS



Originally posted by BrentGMATPrepNow on 19 Jun 2017, 06:52.
Last edited by BrentGMATPrepNow on 04 Feb 2023, 09:45, edited 1 time in total.
General Discussion
User avatar
P
Gnpth
VP
VP
Joined: 29 Aug 2012
Status:Chasing my MBB Dream!
Posts: 1057
Location: United States (DC)
WE:General Management (Aerospace and Defense)
GMAT ToolKit User Reviews Badge
Re: What is the value of x? [#permalink] New post  28 Oct 2014, 08:51
1
Bookmarks
Statement 1: It just says about the lines l1 and l2. Nothing about the other 2 lines L3 and L4. So insufficient.

Statement 2: Says only about the angle of y. Nothing about the lines. So insufficient.

Combining (1) & (2): Still no information on lines L3 and L4.

So the answer is E.
_________________
Become a GMAT Club Premium member to unlock discounts

MBA, Class of 2020,
McDonough School of Business
Signature Read More
User avatar
S
Nunuboy1994
Director
Director
Joined: 12 Nov 2016
Posts: 569
Location: United States
Schools: Yale '18
GMAT 1: 650 Q43 V37
GRE 1: Q157 V158
GPA: 2.66
Re: What is the value of x? [#permalink] New post  17 Jun 2017, 09:39
1
Bookmarks
Bunuel wrote:

Tough and Tricky questions: Coordinate Geometry.



Attachment:
untitled.GIF
What is the value of x?

(1) l1 is parallel to l2
(2) y = 70


Statement 1

l1 parallel to l2 - clearly insufficient because no values given or implied

Statement 2

y=70 we cannot apply transversal properties unless we know that both l1 and l2 and l3 and l4 are all parallel

insuff

Statement 1 and Statement 2

Insuff- we can only find the answer if both vertical lines are also parallel
User avatar
G
TestPrepUnlimited
Tutor
Joined: 17 Sep 2014
Posts: 1252
Location: United States
GMAT 1: 780 Q51 V45
GRE 1: Q170 V167
Re: What is the value of x? [#permalink] New post  26 Dec 2019, 20:24
1
Bookmarks
Expert Reply
Bunuel wrote:

Tough and Tricky questions: Coordinate Geometry.



Attachment:
untitled.GIF
What is the value of x?

(1) l1 is parallel to l2
(2) y = 70


Analyzing the question:
The angles x and y here are too far apart, we need the lines \(L1 L2\) to be parallel AND the lines \(L3 L4\) to be parallel in order to have the relation \(x + y = 180\). That is already two pieces of information needed just to claim the relation between x and y, besides that we still need to know y (given they don't give away x). The statements give only one piece of information each, so combined this is still insufficient.

Ans: E
_________________
Source: We are an NYC based, in-person and online GMAT tutoring and prep company. We are the only GMAT provider in the world to guarantee specific GMAT scores with our flat-fee tutoring packages, or to publish student score increase rates. Our typical new-to-GMAT student score increase rate is 3-9 points per tutoring hour, the fastest in the world. !
Signature Read More
avatar
B
aritranandy8
Intern
Intern
Joined: 03 May 2020
Posts: 18
Re: What is the value of x? [#permalink] New post  17 Feb 2021, 23:58
VeritasKarishma plz explain
User avatar
G
CEdward
VP
VP
Joined: 11 Aug 2020
Posts: 1263
Re: What is the value of x? [#permalink] New post  22 Feb 2021, 20:23
aritranandy8 wrote:
VeritasKarishma plz explain


The question is asking what the angle of x is. (Missing from the question btw). Anyway.

To determine what x is, we need to know whether the two pairs of seemingly 'parallel' lines are in fact, parallel. Else, the value of x can change even when the statements are satisfied.

(1) l1 is parallel to l2
This is insufficient b/c we don't know what y is.

(2) y = 70
This is insufficient b/c we don't know whether l1 and l2 are parallel, and whether l3 and l4 are parallel.

Combined: We still don't know whether l3 and l4 are parallel. You need both sets of lines to be parallel to conclude that x = 70
_________________
"Do not pray for an easy life, pray for the strength to endure a difficult one." - Bruce Lee
Signature Read More
User avatar
B
prithviraj99
Intern
Intern
Joined: 16 May 2022
Posts: 45
Location: India
Concentration: Technology, Marketing
Schools: ISB '24 (A)
GMAT 1: 680 Q50 V31
GPA: 3.08
What is the value of x? [#permalink] New post  21 Jul 2022, 14:16
Image tricked me to assume that l3 and l4 are parallel. Classic C-trap question
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32535
Re: What is the value of x? [#permalink] New post  31 Aug 2023, 05:42
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources
Signature Read More
GMAT Club Bot
gmatclubot
Re: What is the value of x? [#permalink]
31 Aug 2023, 05:42
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
Moderator:
Bunuel
Math Expert
92747 posts

cron

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions