Oct 16 08:00 PM PDT  09:00 PM PDT EMPOWERgmat is giving away the complete Official GMAT Exam Pack collection worth $100 with the 3 Month Pack ($299) Oct 18 08:00 AM PDT  09:00 AM PDT Learn an intuitive, systematic approach that will maximize your success on Fillintheblank GMAT CR Questions. Oct 19 07:00 AM PDT  09:00 AM PDT Does GMAT RC seem like an uphill battle? eGMAT is conducting a free webinar to help you learn reading strategies that can enable you to solve 700+ level RC questions with at least 90% accuracy in less than 10 days. Sat., Oct 19th at 7 am PDT Oct 20 07:00 AM PDT  09:00 AM PDT Get personalized insights on how to achieve your Target Quant Score. Oct 22 08:00 PM PDT  09:00 PM PDT On Demand for $79. For a score of 4951 (from current actual score of 40+) AllInOne Standard & 700+ Level Questions (150 questions)
Author 
Message 
TAGS:

Hide Tags

Intern
Joined: 19 Sep 2014
Posts: 20
GPA: 3.96

Of the 250 students in a certain class, each student who majors in
[#permalink]
Show Tags
Updated on: 08 Jul 2015, 05:47
Question Stats:
64% (02:21) correct 36% (02:29) wrong based on 186 sessions
HideShow timer Statistics
Of the 250 students in a certain class, each student who majors in mathematics also majors in computer science, and 90 of the students major only in Biology. If no student majors in all 3 subjects, how many of the students major in two of the three subjects? (1) 50 of the students major only in computer science (2) 40 of the students do not major in any of the three subjects
Official Answer and Stats are available only to registered users. Register/ Login.
Originally posted by schak2rhyme on 08 Jul 2015, 05:35.
Last edited by Bunuel on 08 Jul 2015, 05:47, edited 1 time in total.
Renamed the topic and edited the question.




CEO
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2977
Location: India
GMAT: INSIGHT
WE: Education (Education)

Re: Of the 250 students in a certain class, each student who majors in
[#permalink]
Show Tags
08 Jul 2015, 11:19
schak2rhyme wrote: Of the 250 students in a certain class, each student who majors in mathematics also majors in computer science, and 90 of the students major only in Biology. If no student majors in all 3 subjects, how many of the students major in two of the three subjects?
(1) 50 of the students major only in computer science (2) 40 of the students do not major in any of the three subjects Answer: Option C Please check the working below...
Attachments
File comment: www.GMATinsight.com
SOl2.jpg [ 261.22 KiB  Viewed 2121 times ]
_________________
Prosper!!!GMATinsightBhoopendra Singh and Dr.Sushma Jha email: info@GMATinsight.com I Call us : +919999687183 / 9891333772 Online OneonOne Skype based classes and Classroom Coaching in South and West Delhihttp://www.GMATinsight.com/testimonials.htmlACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION




Retired Moderator
Joined: 06 Jul 2014
Posts: 1220
Location: Ukraine
Concentration: Entrepreneurship, Technology
GMAT 1: 660 Q48 V33 GMAT 2: 740 Q50 V40

Re: Of the 250 students in a certain class, each student who majors in
[#permalink]
Show Tags
08 Jul 2015, 06:19
schak2rhyme wrote: Of the 250 students in a certain class, each student who majors in mathematics also majors in computer science, and 90 of the students major only in Biology. If no student majors in all 3 subjects, how many of the students major in two of the three subjects?
(1) 50 of the students major only in computer science (2) 40 of the students do not major in any of the three subjects 1) We know information about computers but know nothing about students who do not major at all 2) Know about do not major but don't know about computer. 1+2) We know that biology only = 90 and computer only = 50 Also we know that all math students also major in computers, so math only = 0 Not major 40 students So Total  (Biology only + Computer only + Nor) = Exactly two 250  (90 + 50 + 40) = 70 students Answer is C
_________________



Intern
Joined: 29 Aug 2014
Posts: 3
Location: United States
Concentration: International Business, General Management
WE: Engineering (Energy and Utilities)

Of the 250 students in a certain class, each student who majors in
[#permalink]
Show Tags
08 Jul 2015, 22:20
how is the common term between math and biology zero?



CEO
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2977
Location: India
GMAT: INSIGHT
WE: Education (Education)

Re: Of the 250 students in a certain class, each student who majors in
[#permalink]
Show Tags
08 Jul 2015, 22:56
parthibansubramanian wrote: how is the common term between math and biology zero? Please note that "each student who majors in mathematics also majors in computer science" i.e. There is no one who is in maths but not in Computer Science. There for two regions are marked as Zero by red markerI hope this helps!
_________________
Prosper!!!GMATinsightBhoopendra Singh and Dr.Sushma Jha email: info@GMATinsight.com I Call us : +919999687183 / 9891333772 Online OneonOne Skype based classes and Classroom Coaching in South and West Delhihttp://www.GMATinsight.com/testimonials.htmlACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION



Manager
Joined: 17 Jun 2015
Posts: 195
GMAT 1: 540 Q39 V26 GMAT 2: 680 Q46 V37

Re: Of the 250 students in a certain class, each student who majors in
[#permalink]
Show Tags
22 Dec 2015, 10:30
On the GMAT, we cannot assume that if neither is not stated, then it is zero. In the given question, the collection consists of 250 students. It is wrong to assume that students definitely major in the category  one of the three subjects "at least". We also need to assume that there are students who fall into the category of 'Neither' Can experts please confirm this? Bunuel VeritasPrepKarishma Engr2012 Please help
_________________
Fais de ta vie un rêve et d'un rêve une réalité



CEO
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2977
Location: India
GMAT: INSIGHT
WE: Education (Education)

Re: Of the 250 students in a certain class, each student who majors in
[#permalink]
Show Tags
22 Dec 2015, 21:25
hdwnkr wrote: On the GMAT, we cannot assume that if neither is not stated, then it is zero. In the given question, the collection consists of 250 students. It is wrong to assume that students definitely major in the category  one of the three subjects "at least". We also need to assume that there are students who fall into the category of 'Neither' Can experts please confirm this? Bunuel VeritasPrepKarishma Engr2012 Please help Please read the question and solution carefully. There is no assumption taken. Yes, you are right that we can't assume if something has not been stated and we have no way to conclude about it. Here, solution doesn't consider none of three as zero, Taking that zero would contradict with second statement and violate rule of GMAT mathematics.
_________________
Prosper!!!GMATinsightBhoopendra Singh and Dr.Sushma Jha email: info@GMATinsight.com I Call us : +919999687183 / 9891333772 Online OneonOne Skype based classes and Classroom Coaching in South and West Delhihttp://www.GMATinsight.com/testimonials.htmlACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION



NonHuman User
Joined: 09 Sep 2013
Posts: 13208

Re: Of the 250 students in a certain class, each student who majors in
[#permalink]
Show Tags
21 Jan 2019, 19:51
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.
_________________




Re: Of the 250 students in a certain class, each student who majors in
[#permalink]
21 Jan 2019, 19:51






