Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

It is currently 20 Jul 2019, 03:06

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 triangle ABC above, what is the measure of angle DBC ?

  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: 56300
In triangle ABC above, what is the measure of angle DBC ?  [#permalink]

Show Tags

New post 24 Dec 2017, 01:54
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

67% (01:37) correct 33% (01:49) wrong based on 67 sessions

HideShow timer Statistics


Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 56300
Re: In triangle ABC above, what is the measure of angle DBC ?  [#permalink]

Show Tags

New post 24 Dec 2017, 01:54
Manager
Manager
avatar
S
Joined: 15 Aug 2016
Posts: 208
Location: India
Concentration: Technology, Operations
GMAT 1: 690 Q49 V35
GPA: 3.84
WE: Operations (Consulting)
In triangle ABC above, what is the measure of angle DBC ?  [#permalink]

Show Tags

New post Updated on: 24 Dec 2017, 05:42
IMO :B
statement1: Dont know what angle is equal to what.insuff
Statement2: <ADB=100
=> <ADB + 2x=180 (Linear Pair)
=> x=40.
=><DBC=180-80-80=20. Sufficient.

Waiting for OA

Originally posted by Mick1005 on 24 Dec 2017, 04:07.
Last edited by Mick1005 on 24 Dec 2017, 05:42, edited 1 time in total.
Retired Moderator
User avatar
V
Joined: 28 Mar 2017
Posts: 1212
Location: India
GMAT 1: 730 Q49 V41
GPA: 4
Re: In triangle ABC above, what is the measure of angle DBC ?  [#permalink]

Show Tags

New post 24 Dec 2017, 05:20
Bunuel wrote:
Image

In triangle ABC above, what is the measure of angle DBC ?

(1) Triangle ABD is isosceles.
(2) Angle ADB = 100


IMO answer should be "B". Awaiting OA

Statement 1: Even without knowing the fact given in statement 1, we can conclude that ABD=x. Thus this point is insufficient

Statement 2: 100=2x + DBC; also DBC=180-4x
=>2x=80 =>x=40; therefore, DBC=20. This is sufficient
_________________
Manager
Manager
avatar
G
Joined: 24 Nov 2016
Posts: 235
Location: United States
CAT Tests
In triangle ABC above, what is the measure of angle DBC ?  [#permalink]

Show Tags

New post Updated on: 25 Dec 2017, 12:12
Bunuel wrote:
Bunuel wrote:
Image

In triangle ABC above, what is the measure of angle DBC ?

(1) Triangle ABD is isosceles.
(2) Angle ADB = 100


Similar question from OG: https://gmatclub.com/forum/in-triangle- ... 68281.html


The interior angles of a triangle sum to 180.
An isosceles triangle has 2 equal angles that are equal sides.
Since \(DBC = 180 - (2x+2x)\), all we need to do is find the value for \(x\).

(1) Triangle ABD is isosceles. So, AB = BD or AB = AD, since we don't know which one we cannot find DBC, this is insufficient.

(2) Angle ADB = 100. Angles ADB + BDC = 180, so 100 + 2x = 180, 2x = 180 - 100, x = 40. To find DBC, this is sufficient.

(B) is the answer.

Originally posted by exc4libur on 24 Dec 2017, 14:03.
Last edited by exc4libur on 25 Dec 2017, 12:12, edited 1 time in total.
Manager
Manager
avatar
B
Joined: 17 Sep 2017
Posts: 54
Re: In triangle ABC above, what is the measure of angle DBC ?  [#permalink]

Show Tags

New post 25 Dec 2017, 03:39
IMO : B
(1) We don't know whether AB = BD or AB = AD
(2) We certainly know AB = BD => ADB = 100 = DBC + DCB = 180 - 2.2x + 2x => We can calculate x hence we will know DBC angle
GMAT Club Bot
Re: In triangle ABC above, what is the measure of angle DBC ?   [#permalink] 25 Dec 2017, 03:39
Display posts from previous: Sort by

In triangle ABC above, what is the measure of angle DBC ?

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





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