It is currently 17 Nov 2018, 19:44
My Tests

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.

Each student in a class is to choose an optional subject.

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
Joined: 15 Sep 2017
Posts: 34
Followers: 0

Kudos [?]: 15 [0], given: 2

Each student in a class is to choose an optional subject. [#permalink] New post 12 Sep 2018, 22:35
00:00

Question Stats:

100% (01:07) correct 0% (00:00) wrong based on 5 sessions
Each student in a class to choose an optional subject.If \(\frac{1}{5}\) chose math,\(\frac{1}{4}\)chose biology,\(\frac{1}{2}\) chose history and the remaining 10 chose psychology.what is the number of students in the class?


A) 80


B) 110


C) 160


D) 200


E) 400
[Reveal] Spoiler: OA
1 KUDOS received
Director
Director
Joined: 20 Apr 2016
Posts: 743
Followers: 6

Kudos [?]: 500 [1] , given: 86

CAT Tests
Re: Each student in a class is to choose an optional subject. [#permalink] New post 13 Sep 2018, 19:34
1
This post received
KUDOS
AchyuthReddy wrote:
Each student in a class to choose an optional subject.If \(\frac{1}{5}\) chose math,\(\frac{1}{4}\)chose biology,\(\frac{1}{2}\) chose history and the remaining 10 chose psychology.what is the number of students in the class?


A) 80


B) 110


C) 160


D) 200


E) 400


Let X be the total no.

so \(x-\frac{x}{5}-\frac{x}{4}-\frac{x}{2} = 10\)

or \(x(1-\frac{1}{5}-\frac{1}{4}-\frac{1}{2}) = 10\)

or \(x = 10 * 20 = 200\)


------------------------------------------------

Another way to solve ,

just use the number from the solution

it is always advisable to start with option C

So if the total no. = 160,

then \((\frac{1}{5} * 160) + (\frac{1}{4} * 160) + (\frac{1}{2} * 160)\) = not equal to 160

move to option D

if the total no is 200 then

then \((\frac{1}{5}* 200) + (\frac{1}{4} * 200) + (\frac{1}{2} * 200) = 200\)and hence our answer
_________________

If you found this post useful, please let me know by pressing the Kudos Button

Re: Each student in a class is to choose an optional subject.   [#permalink] 13 Sep 2018, 19:34
Display posts from previous: Sort by

Each student in a class is to choose an optional subject.

  Question banks Downloads My Bookmarks Reviews Important topics  


GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

Powered by phpBB © phpBB Group

Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.