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

It is currently 18 Oct 2019, 20:02

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

In the figure above, what is the length of AD?

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58453
In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 22 Dec 2014, 08:56
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

77% (01:07) correct 23% (01:15) wrong based on 185 sessions

HideShow timer Statistics

Manager
Manager
avatar
Joined: 14 Dec 2014
Posts: 51
Location: India
Concentration: Technology, Finance
GPA: 3.87
WE: Programming (Computer Software)
Re: In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 22 Dec 2014, 09:24
1
1. CD is not known.Insufficient
2.AB is not known. Insufficeint

1+2 > > AB+2(BC)+CD=12 >> AD+BC=12
BC is not known. Insufficient

E
_________________
If you like my posts appreciate them with Kudos :)
Cheers!!
Manager
Manager
User avatar
B
Joined: 20 Feb 2013
Posts: 73
Location: India
GMAT 1: 690 Q49 V34
WE: Information Technology (Computer Software)
Reviews Badge
Re: In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 22 Dec 2014, 10:21
1
Determine the length of AD?

Statement 1: AC = 6
We don't know CD -- Insufficient

Statement 2: BD = 6
We don't know AB -- Insufficient

Combining 1&2:
AC + BD = 12, here BC is accounted twice and since we don't know BC -- Insufficient

Answer E
_________________
If my post is helpful/correct, consider giving Kudos..
Manager
Manager
avatar
Joined: 27 Jan 2013
Posts: 172
Location: United States
Concentration: Entrepreneurship, Marketing
GMAT 1: 730 Q49 V40
GPA: 3.5
WE: Supply Chain Management (Telecommunications)
GMAT ToolKit User
Re: In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 22 Dec 2014, 20:21
1
First thing you need to understand after looking at the figure position of points related to each other is not given. DO NOT ASSUME.

S(1): Tells nothing about CD hence N.S
S(2): Tells nothing about AB hence N.S

Event after combining we do not know distance between B & C which could be 6 or 0.01 . Hence Not sufficient.

I think this could have been a little more trickier if we were asked maximum length of AD will always be smaller then which number. The answer would be 12 assuming B&C are very close to each other and even if they are on top of each other the maximum length can be 12.
Manager
Manager
avatar
Joined: 21 Aug 2010
Posts: 164
Location: United States
GMAT 1: 700 Q49 V35
GMAT ToolKit User
Re: In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 23 Dec 2014, 11:26
1
Bunuel wrote:

Tough and Tricky questions: Geometry Problems.



Attachment:
2014-12-22_1955.png

In the figure above, what is the length of AD?

(1) AC = 6
(2) BD = 6

Kudos for a correct solution.



AD = AB+BC+CD

From Statement 1: AC =6; AD = 6+CD(We cannot find using given information)
Statement 2: BD = 6; AD= 6+AB (Again, We cannot find using given information)
Combining both also not sufficient to find the value


Ans : E
_________________
-------------------------------------
Intern
Intern
avatar
Joined: 30 Jul 2008
Posts: 19
Re: In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 15 Aug 2015, 01:54
Bunuel wrote:
Bunuel wrote:

Tough and Tricky questions: Geometry Problems.



Attachment:
2014-12-22_1955.png

In the figure above, what is the length of AD?

(1) AC = 6
(2) BD = 6

Kudos for a correct solution.


The correct answer is E.


Hi Bunnuel,

My soln was:

AD = AC + BD - BC (as in AC + BD , BC is already counted)
NOw as AC=BD = 6, both points B and C are same. ( Taking St 1 and St 2 together)

so AD = 12.

Can you Pls. guide me where I went wrong?
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58453
Re: In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 16 Aug 2015, 13:53
robinpallickal wrote:
Bunuel wrote:
Bunuel wrote:

Tough and Tricky questions: Geometry Problems.



Attachment:
2014-12-22_1955.png

In the figure above, what is the length of AD?

(1) AC = 6
(2) BD = 6

Kudos for a correct solution.


The correct answer is E.


Hi Bunnuel,

My soln was:

AD = AC + BD - BC (as in AC + BD , BC is already counted)
NOw as AC=BD = 6, both points B and C are same. ( Taking St 1 and St 2 together)

so AD = 12.

Can you Pls. guide me where I went wrong?


Image
The red part is not correct. Consider AB = 5, BC = 1, and CD = 5 OR AB = 4, BC = 2, and CD = 4.
_________________
Retired Moderator
User avatar
V
Joined: 27 Oct 2017
Posts: 1259
Location: India
Concentration: International Business, General Management
GPA: 3.64
WE: Business Development (Energy and Utilities)
Re: In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 31 Mar 2018, 09:28
Try to draw the line diagram in mind to solve the question in seconds.
As we do not know the overlap of AC & BD, it is insufficient.

See the sketch.
Attachments

WhatsApp Image 2018-03-31 at 21.54.22.jpeg
WhatsApp Image 2018-03-31 at 21.54.22.jpeg [ 120.86 KiB | Viewed 2285 times ]


_________________
Retired Moderator
avatar
P
Joined: 22 Aug 2013
Posts: 1428
Location: India
In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 01 Apr 2018, 22:59
Bunuel wrote:

Tough and Tricky questions: Geometry Problems.



Image
In the figure above, what is the length of AD?

(1) AC = 6
(2) BD = 6

Kudos for a correct solution.

Attachment:
2014-12-22_1955.png



We can also solve this question by taking AB=x, BC=y, CD=z. So we need to find AD, which is x+y+z

Statement 1:
Gives us x+y = 6, so it is not sufficient.

Statement 2:
Gives us y+z = 6, so again not sufficient.

Combining, we can add the two, we get:
x+y + y+z = 6+6 OR x+y+z + y = 12
Unless we know y, we cannot find x+y+z. So not sufficient.

Hence E answer
VP
VP
User avatar
P
Joined: 14 Feb 2017
Posts: 1196
Location: Australia
Concentration: Technology, Strategy
Schools: LBS '22
GMAT 1: 560 Q41 V26
GMAT 2: 550 Q43 V23
GMAT 3: 650 Q47 V33
GMAT 4: 650 Q44 V36
WE: Management Consulting (Consulting)
Reviews Badge CAT Tests
Re: In the figure above, what is the length of AD?  [#permalink]

Show Tags

New post 22 Jul 2019, 18:18
If we were told that A,B,C and D were equidistant then AD would equal 9.

But we aren't, so we cannot deduce that each distance is equal.

CD could equal 5 and BC could equal 1, so AD= 11 in this case.

Combined insufficient.
Attachments

Capture.JPG
Capture.JPG [ 14.54 KiB | Viewed 606 times ]


_________________
Goal: Q49, V41

+1 Kudos if I have helped you
GMAT Club Bot
Re: In the figure above, what is the length of AD?   [#permalink] 22 Jul 2019, 18:18
Display posts from previous: Sort by

In the figure above, what is the length of AD?

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





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