Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 25 May 2017, 12:00

### 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

# Of the 200 students at college T majoring in one or more of

Author Message
Manager
Joined: 23 Jan 2008
Posts: 108
Followers: 2

Kudos [?]: 82 [0], given: 0

Of the 200 students at college T majoring in one or more of [#permalink]

### Show Tags

25 Jan 2008, 12:52
2
This post was
BOOKMARKED
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Of the 200 students at college T majoring in one or more of the sciences, 130 are majoring in chemistry and 150 are majoring in biology. If atleast 30 of the students are not majoring in either chemistry or biology, then the number of students majoring in both chemistry and biology could be any number from

A 20 to 50
B 40 to 70
C 50 to 130
D 110 to 130
E 110 to 150
Manager
Joined: 01 Sep 2007
Posts: 100
Location: Astana
Followers: 1

Kudos [?]: 27 [0], given: 0

### Show Tags

25 Jan 2008, 13:11
d
200-30 = 170

170-150=20
130-20=110

130
Senior Manager
Joined: 28 Feb 2007
Posts: 304
Followers: 1

Kudos [?]: 40 [0], given: 0

### Show Tags

25 Jan 2008, 13:12
d.
Set rule/formula
Ch + Bio+neither-both(Ch and Bio)=Total
130+150+30-x=200 x=110 min
X max=130 because Chemistry members could be at the same time members of Biology class but not vice versa.
Director
Joined: 01 Jan 2008
Posts: 624
Followers: 5

Kudos [?]: 184 [0], given: 1

### Show Tags

25 Jan 2008, 13:13
1
This post was
BOOKMARKED
D: 110-130
A - students who major in chemistry, B - students who major in biology.

P(A+B) = P(A) + P(B) - P(A*B)

Since P(A+B) <= 200-30 = 170, then

P(A) + P(B) - P(A*B) <= 170, P(A*B) >= P(A)+P(B) - 170 = 130+150-170 = 110, 110 - possible 30 students major in neither bio or chem, 20 major only in chem, 110 in both chem and bio, 40 - in bio only

P(A*B) <= min(P(A), P(B)) = 130 - possible when all students who major in chemistry also major in biology
Re: students   [#permalink] 25 Jan 2008, 13:13
Display posts from previous: Sort by

# Of the 200 students at college T majoring in one or more of

 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®.