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

It is currently 13 Oct 2019, 20:28

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 a photography exhibition, some photographs were taken by

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

Hide Tags

Find Similar Topics 
Senior Manager
Senior Manager
User avatar
Joined: 21 Oct 2013
Posts: 411
In a photography exhibition, some photographs were taken by  [#permalink]

Show Tags

New post 29 Jul 2014, 06:51
5
1
5
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

70% (01:39) correct 30% (02:04) wrong based on 205 sessions

HideShow timer Statistics

In a photography exhibition, some photographs were taken by Octavia the photographer, and some photographs were framed by Jack the framer. Jack had framed 24 photographs taken by Octavia, and 12 photographs taken by other photographers. If 36 of the photographs in the exhibition were taken by Octavia, how many photographs were either framed by Jack or taken by Octavia?

A. 36
B. 48
C. 72
D. 96
E. 108
Most Helpful Expert Reply
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58335
Re: In a photography exhibition, some photographs were taken by  [#permalink]

Show Tags

New post 29 Jul 2014, 08:22
4
1
goodyear2013 wrote:
In a photography exhibition, some photographs were taken by Octavia the photographer, and some photographs were framed by Jack the framer. Jack had framed 24 photographs taken by Octavia, and 12 photographs taken by other photographers. If 36 of the photographs in the exhibition were taken by Octavia, how many photographs were either framed by Jack or taken by Octavia?

A. 36
B. 48
C. 72
D. 96
E. 108


Check the matrix below:
Attachment:
Untitled.png
Untitled.png [ 4.56 KiB | Viewed 3275 times ]
Numbers in black are given and in red calculated based on them.

The number of photographs either framed by Jack or taken by Octavia = {Jack} + {Octavia} - {overlap} = 36 + 36 - 24 = 48 ({overlap} is green box).

Answer: B.
_________________
General Discussion
Intern
Intern
avatar
Joined: 20 Mar 2012
Posts: 2
Schools: Yale
Reviews Badge
Re: In a photography exhibition, some photographs were taken by  [#permalink]

Show Tags

New post 04 Oct 2015, 19:10
I have a question. Why can't we just add 12 + 12 i.e photos clicked only by Octavia and not framed by Jack + Photos framed only by Jack and not clicked by Olivia?
Veritas Prep GMAT Instructor
User avatar
V
Joined: 16 Oct 2010
Posts: 9695
Location: Pune, India
Re: In a photography exhibition, some photographs were taken by  [#permalink]

Show Tags

New post 05 Oct 2015, 00:42
1
mankakhanna wrote:
I have a question. Why can't we just add 12 + 12 i.e photos clicked only by Octavia and not framed by Jack + Photos framed only by Jack and not clicked by Olivia?


Either A or B includes "Both" too.
So you also need to include the 24 that were taken by Octavia AND framed by Jack.
You get 12 + 12 + 24 = 48

Either Or in logic/Math is a bit different from the way we understand it in day-to-day language.
In Math, "Either A or B" means that it is at least one of A and B. It could be both too.
Either the car is red in colour or it is a Ferrari means it could be a Red Ferrari too but it is definitely at least one of them.
_________________
Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >
Target Test Prep Representative
User avatar
D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8040
Location: United States (CA)
Re: In a photography exhibition, some photographs were taken by  [#permalink]

Show Tags

New post 01 Jul 2019, 17:19
goodyear2013 wrote:
In a photography exhibition, some photographs were taken by Octavia the photographer, and some photographs were framed by Jack the framer. Jack had framed 24 photographs taken by Octavia, and 12 photographs taken by other photographers. If 36 of the photographs in the exhibition were taken by Octavia, how many photographs were either framed by Jack or taken by Octavia?

A. 36
B. 48
C. 72
D. 96
E. 108


We can use the formula:

N(Octavia or Jack) = N(Octavia) + N(Jack) - N(Both)

Therefore, we have:

N(Octavia or Jack) = 36 + 36 - 24 = 72 - 24 = 48

Answer: B
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

GMAT Club Bot
Re: In a photography exhibition, some photographs were taken by   [#permalink] 01 Jul 2019, 17:19
Display posts from previous: Sort by

In a photography exhibition, some photographs were taken by

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





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