GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 13 Dec 2018, 08:57

R1 Admission Decisions:

Stanford Chat (Calls Started)  |  Wharton Chat  (Calls Expected Soon)  |  Fuqua Chat (Calls Expected Soon)


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.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
  • The winning strategy for 700+ on the GMAT

     December 13, 2018

     December 13, 2018

     08:00 AM PST

     09:00 AM PST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.
  • GMATbuster's Weekly GMAT Quant Quiz, Tomorrow, Saturday at 9 AM PST

     December 14, 2018

     December 14, 2018

     09:00 AM PST

     10:00 AM PST

    10 Questions will be posted on the forum and we will post a reply in this Topic with a link to each question. There are prizes for the winners.

Does x = y? (1) z = u (2) ABCD is a parallelogram

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 51185
Does x = y? (1) z = u (2) ABCD is a parallelogram  [#permalink]

Show Tags

New post 17 Oct 2017, 22:42
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

48% (00:55) correct 52% (00:46) wrong based on 47 sessions

HideShow timer Statistics

SC Moderator
User avatar
D
Joined: 13 Apr 2015
Posts: 1687
Location: India
Concentration: Strategy, General Management
GMAT 1: 200 Q1 V1
GPA: 4
WE: Analyst (Retail)
GMAT ToolKit User Premium Member
Re: Does x = y? (1) z = u (2) ABCD is a parallelogram  [#permalink]

Show Tags

New post 18 Oct 2017, 05:52
Question: x = y?

St1: z = u
y + z + B = 180 --> y + z = 180 - B
x + u + D = 180 --> x + u = 180 - D
We do not know whether B = D. Hence we cannot prove that x = y.
Not Sufficient.

St2: ABCD is a parallelogram --> B = D and x + y = u + z
Not sufficient.

Combining St1 and St2, we have
y + u = 180 - B
x + u = 180 - B (since B = D)
So, x = 180 - B - u = y
Sufficient.

Answer: C
Ask GMAT Experts Forum Moderator
User avatar
V
Status: Preparing for GMAT
Joined: 25 Nov 2015
Posts: 984
Location: India
GPA: 3.64
GMAT ToolKit User Premium Member Reviews Badge CAT Tests
Re: Does x = y? (1) z = u (2) ABCD is a parallelogram  [#permalink]

Show Tags

New post 18 Oct 2017, 06:08
Bunuel wrote:
Image
Does x = y?

(1) z = u
(2) ABCD is a parallelogram


Attachment:
2017-10-18_1040.png


S1 - z=u
But we don't know anything else, x and y could be or could not be equal.
Insufficient.
S2 - ABCD is a parallelogram and AC is the diagonal.
Therefore, y=u and x=z (Alternate angles of a line intersecting two parallel lines are equal)
But we don't know if x=y
Insufficient.

Combining S1 & S2, x=z=u=y
Sufficient
Answer C.
_________________

Please give kudos, if you like my post

When the going gets tough, the tough gets going...

Manager
Manager
User avatar
B
Joined: 09 Aug 2017
Posts: 62
Location: United States
Concentration: Technology
GMAT 1: 640 Q44 V33
GMAT 2: 630 Q47 V29
WE: Research (Investment Banking)
Re: Does x = y? (1) z = u (2) ABCD is a parallelogram  [#permalink]

Show Tags

New post 23 Oct 2017, 17:11
B, I got this wrong and I see what I did here, assuming I am wrong. I assumed that the diagonal bisected the angles in a parallelogram, but that's only the case if it's a rhombus.
_________________

I'd love to hear any feedback or ways to improve my problem solving. I make a lot of silly mistakes. If you've had luck improving on stupid mistakes, I'd love to hear how you did it.

Also, I appreciate any kudos.

GMAT Club Bot
Re: Does x = y? (1) z = u (2) ABCD is a parallelogram &nbs [#permalink] 23 Oct 2017, 17:11
Display posts from previous: Sort by

Does x = y? (1) z = u (2) ABCD is a parallelogram

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.