It is currently 17 Dec 2017, 04:14

### 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

# At the elite university, 500 students study Computer Science

Author Message
TAGS:

### Hide Tags

Intern
Joined: 04 Jun 2013
Posts: 2

Kudos [?]: 52 [1], given: 2

At the elite university, 500 students study Computer Science [#permalink]

### Show Tags

05 Aug 2013, 06:47
1
KUDOS
5
This post was
BOOKMARKED
00:00

Difficulty:

35% (medium)

Question Stats:

65% (01:09) correct 35% (01:06) wrong based on 162 sessions

### HideShow timer Statistics

At the elite university, 500 students study Computer Science or Electrical Engineering or both. If 100 of these students do not study Electrical Engineering, how many of these students study both Computer Science and Electrical Engineering?

(1) Of the 500 students, 90 do not study Computer Science.
(2) A total of 410 of the students study Computer Science.
[Reveal] Spoiler: OA

Last edited by Zarrolou on 05 Aug 2013, 06:59, edited 1 time in total.
Edited the question, renamed the topic and added OA.

Kudos [?]: 52 [1], given: 2

VP
Status: Far, far away!
Joined: 02 Sep 2012
Posts: 1120

Kudos [?]: 2407 [0], given: 219

Location: Italy
Concentration: Finance, Entrepreneurship
GPA: 3.8
Re: At the elite university, 500 students study Computer Science [#permalink]

### Show Tags

05 Aug 2013, 06:59
At the elite university, 500 students study Computer Science or Electrical Engineering or both. If 100 of these students do not study Electrical Engineering, how many of these students study both Computer Science and Electrical Engineering?

Let ONLY Computer Science students be $$a$$, ONLY Electrical Engineering students be $$c$$ and students of BOTH be $$b$$.
$$a+b+c=500$$ the text says $$a=100$$ (students do not study Electrical Engineering, so study ONLY CS). We have to find $$b$$.

(1) Of the 500 students, 90 do not study Computer Science.
So the students of ONLY EE are $$90=c$$.
$$100+b+90=500$$, $$b=310$$.
Sufficient

(2) A total of 410 of the students study Computer Science.
$$a+b=410$$, $$100+b=410$$, $$b=310$$.
Sufficient
_________________

It is beyond a doubt that all our knowledge that begins with experience.

Kant , Critique of Pure Reason

Tips and tricks: Inequalities , Mixture | Review: MGMAT workshop
Strategy: SmartGMAT v1.0 | Questions: Verbal challenge SC I-II- CR New SC set out !! , My Quant

Rules for Posting in the Verbal Forum - Rules for Posting in the Quant Forum[/size][/color][/b]

Kudos [?]: 2407 [0], given: 219

Director
Joined: 14 Dec 2012
Posts: 832

Kudos [?]: 1646 [0], given: 197

Location: India
Concentration: General Management, Operations
GMAT 1: 700 Q50 V34
GPA: 3.6
Re: At the elite university, 500 students study Computer Science [#permalink]

### Show Tags

05 Aug 2013, 07:11
manasishah wrote:
At the elite university, 500 students study Computer Science or Electrical Engineering or both. If 100 of these students do not study Electrical Engineering, how many of these students study both Computer Science and Electrical Engineering?

(1) Of the 500 students, 90 do not study Computer Science.
(2) A total of 410 of the students study Computer Science.

GIVEN
CS only + EE only + B =500 (500 students study Computer Science or Electrical Engineering or both).....1
CS only = 100 (100 of these students do not study Electrical Engineering).....2

STMNT 1: Of the 500 students, 90 do not study Computer Science.
EE only = 90
puting the values in eqn 1
100 + 90 + B =500
HENCE B=310
SUFFICIENT

STMNT 2:
A total of 410 of the students study Computer Science.
MEANS 90 STUDY ONLY EE
SAME INFORMATION AS STMNT 1
HENCE SUFFICIENT

SO D
_________________

When you want to succeed as bad as you want to breathe ...then you will be successfull....

GIVE VALUE TO OFFICIAL QUESTIONS...

learn AWA writing techniques while watching video : http://www.gmatprepnow.com/module/gmat-analytical-writing-assessment

Kudos [?]: 1646 [0], given: 197

Manager
Status: Looking to improve
Joined: 15 Jan 2013
Posts: 174

Kudos [?]: 75 [0], given: 65

GMAT 1: 530 Q43 V20
GMAT 2: 560 Q42 V25
GMAT 3: 650 Q48 V31
Re: At the elite university, 500 students study Computer Science [#permalink]

### Show Tags

05 Aug 2013, 07:14
manasishah wrote:
At the elite university, 500 students study Computer Science or Electrical Engineering or both. If 100 of these students do not study Electrical Engineering, how many of these students study both Computer Science and Electrical Engineering?

(1) Of the 500 students, 90 do not study Computer Science.
(2) A total of 410 of the students study Computer Science.

Rephrasing the question information in a matrix visual. The value of the cell ?? is asked to be found.

Computer Science Not Computer Science Total
-----------------------------------------------------------------------------------------------------------------------
Electrical Engineering ?? 400
-----------------------------------------------------------------------------------------------------------------------
Not Electrical Engineering 100 0 100
------------------------------------------------------------------------------------------------------------------------
Total 500
-----------------------------------------------------------------------------------------------------------------------

From stmt 1, the matrix is updated as follows. Hence sufficient.

Computer Science Not Computer Science Total
-----------------------------------------------------------------------------------------------------------------------
Electrical Engineering ? = 310 90 400
-----------------------------------------------------------------------------------------------------------------------
Not Electrical Engineering 100 0 100
------------------------------------------------------------------------------------------------------------------------
Total 500
-----------------------------------------------------------------------------------------------------------------------

From stmt 2, the matrix is updated as follows. Hence sufficient.

Computer Science Not Computer Science Total
-----------------------------------------------------------------------------------------------------------------------
Electrical Engineering ? = 310 400
-----------------------------------------------------------------------------------------------------------------------
Not Electrical Engineering 100 0 100
------------------------------------------------------------------------------------------------------------------------
Total 410 500
-----------------------------------------------------------------------------------------------------------------------

Hope this helps
_________________

KUDOS is a way to say Thank You

Kudos [?]: 75 [0], given: 65

Non-Human User
Joined: 09 Sep 2013
Posts: 14797

Kudos [?]: 288 [0], given: 0

Re: At the elite university, 500 students study Computer Science [#permalink]

### Show Tags

03 Sep 2017, 21:17
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

Kudos [?]: 288 [0], given: 0

Re: At the elite university, 500 students study Computer Science   [#permalink] 03 Sep 2017, 21:17
Display posts from previous: Sort by