Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 24 Apr 2014, 19:25

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# In a certain school of dolphins, 20 dolphins eat neither

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Moderator
Joined: 25 Apr 2012
Posts: 341
Location: India
Concentration: Marketing, International Business
GMAT Date: 11-07-2013
GPA: 3.21
WE: Business Development (Other)
Followers: 5

Kudos [?]: 113 [0], given: 430

In a certain school of dolphins, 20 dolphins eat neither [#permalink]  30 Jan 2014, 01:00
00:00

Difficulty:

35% (medium)

Question Stats:

76% (03:03) correct 24% (01:36) wrong based on 25 sessions
In a certain school of dolphins, 20 dolphins eat neither sardines nor tuna. 50 of the dolphins do not eat tuna, and 60 eat sardines. Which of the following statements regarding the school of dolphins is possible?

A. 10 dolphins do not eat sardines.
B. 20 dolphins eat both sardines and tuna.
C. 40 of the school dolphins that do not eat tuna, eat sardines.
D. There are 70 dolphins in the school.
E. 30 of the dolphins eat tuna.

PS: Do not attempt the question if you are planning to take Economist Gmat Tutor free Simulation test.
[Reveal] Spoiler: OA

_________________

“Many of life's failures are people who did not realize how close they were to success when they gave up.”

“If you can't fly then run, if you can't run then walk, if you can't walk then crawl, but whatever you do you have to keep moving forward.”

“Renew, release, let go. Yesterday’s gone. There’s nothing you can do to bring it back. You can’t “should’ve” done something. You can only DO something. Renew yourself. Release that attachment. Today is a new day!”

 Kaplan Promo Code Knewton GMAT Discount Codes Manhattan GMAT Discount Codes
Math Expert
Joined: 02 Sep 2009
Posts: 17396
Followers: 2891

Kudos [?]: 18504 [0], given: 2362

Re: In a certain school of dolphins, 20 dolphins eat neither [#permalink]  30 Jan 2014, 01:23
Expert's post
WoundedTiger wrote:
In a certain school of dolphins, 20 dolphins eat neither sardines nor tuna. 50 of the dolphins do not eat tuna, and 60 eat sardines. Which of the following statements regarding the school of dolphins is possible?

A. 10 dolphins do not eat sardines.
B. 20 dolphins eat both sardines and tuna.
C. 40 of the school dolphins that do not eat tuna, eat sardines.
D. There are 70 dolphins in the school.
E. 30 of the dolphins eat tuna.

PS: Do not attempt the question if you are planning to take Economist Gmat Tutor free Simulation test.

Set a matrix:
Attachment:

Untitled.png [ 4.58 KiB | Viewed 237 times ]
As you can see only E is possible: if there are 0 dolphins who eat tuna but do not eat sardines, then 30 of the dolphins eat tuna (first row).

_________________
Re: In a certain school of dolphins, 20 dolphins eat neither   [#permalink] 30 Jan 2014, 01:23
Similar topics Replies Last post
Similar
Topics:
CR: dolphins 3 21 Oct 2004, 02:20
Researchers have explored the possibility that dolphins are 11 14 Jan 2005, 09:14
7 Researchers have explored the possibility that dolphins are 14 25 Nov 2005, 10:37
dolphins 13 11 Nov 2007, 15:12
In polluted environments, dolphins gradually accumulated 9 04 May 2008, 11:33
Display posts from previous: Sort by

# In a certain school of dolphins, 20 dolphins eat neither

 Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO 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®.