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

 It is currently 18 Sep 2018, 10:38

### 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

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

# If the sum of two angles of a parallelogram is 100°, what is the avera

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

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 49206
If the sum of two angles of a parallelogram is 100°, what is the avera  [#permalink]

### Show Tags

28 Sep 2017, 23:50
1
00:00

Difficulty:

15% (low)

Question Stats:

83% (00:29) correct 17% (00:44) wrong based on 40 sessions

### HideShow timer Statistics

If the sum of two angles of a parallelogram is 100°, what is the average (arithmetic mean) of the measures of the other two angles?

(A) 50
(B) 90
(C) 130
(D) 180
(E) 260

_________________
Intern
Joined: 28 Sep 2017
Posts: 24
Location: India
Concentration: Technology, General Management
GPA: 3.5
WE: Information Technology (Computer Software)
Re: If the sum of two angles of a parallelogram is 100°, what is the avera  [#permalink]

### Show Tags

29 Sep 2017, 02:02
1
sum of two angles of a parallelogram is 100°
so sum of the other two angle should be (360-100)/2 = 130
So mean should be (130+130)/2 = 130

Answer should be C
Senior SC Moderator
Joined: 22 May 2016
Posts: 1972
If the sum of two angles of a parallelogram is 100°, what is the avera  [#permalink]

### Show Tags

29 Sep 2017, 14:01
1
Bunuel wrote:
If the sum of two angles of a parallelogram is 100°, what is the average (arithmetic mean) of the measures of the other two angles?

(A) 50
(B) 90
(C) 130
(D) 180
(E) 260

The sum of interior angles of a quadrilateral is 360 degrees.

Though we are not sure which two angle measures sum to 100, we are asked only for the average (arithmetic mean) of the other two.

There are (360 - 100) = 260 degrees that remain, and two angles.

$$\frac{260}{2}$$ = 130

_________________

In the depths of winter, I finally learned
that within me there lay an invincible summer.

Target Test Prep Representative
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2835
Re: If the sum of two angles of a parallelogram is 100°, what is the avera  [#permalink]

### Show Tags

03 Oct 2017, 16:34
Bunuel wrote:
If the sum of two angles of a parallelogram is 100°, what is the average (arithmetic mean) of the measures of the other two angles?

(A) 50
(B) 90
(C) 130
(D) 180
(E) 260

A parallelogram’s angles always sum to 360 degrees. If the sum of two angles of a parallelogram is 100 degrees, then the remaining 2 angles must sum to 260 degrees, and so the average of those two angles is 260/2 = 130 degrees.

_________________

Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Re: If the sum of two angles of a parallelogram is 100°, what is the avera &nbs [#permalink] 03 Oct 2017, 16:34
Display posts from previous: Sort by

# If the sum of two angles of a parallelogram is 100°, what is the avera

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

# Events & Promotions

 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®.