GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Jun 2019, 00:03

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.

Close

Request Expert Reply

Confirm Cancel

James's library contains reference, biography, and fiction books only,

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 55639
James's library contains reference, biography, and fiction books only,  [#permalink]

Show Tags

New post 12 Dec 2018, 01:44
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

89% (00:41) correct 11% (00:34) wrong based on 43 sessions

HideShow timer Statistics

CEO
CEO
User avatar
P
Joined: 18 Aug 2017
Posts: 3866
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member CAT Tests
Re: James's library contains reference, biography, and fiction books only,  [#permalink]

Show Tags

New post 12 Dec 2018, 01:54
Bunuel wrote:
James's library contains reference, biography, and fiction books only, in the ratio of 1:2:7, respectively. If James's library contains 30 books, how many biographies does he own?

A. 2
B. 3
C. 4
D. 6
E. 10



total : 10 in ratio

so Biography : 10x/2= 30

x= 6 IMO D
_________________
If you liked my solution then please give Kudos. Kudos encourage active discussions.
e-GMAT Representative
User avatar
D
Joined: 04 Jan 2015
Posts: 2888
Re: James's library contains reference, biography, and fiction books only,  [#permalink]

Show Tags

New post 12 Dec 2018, 01:56

Solution



Given:
    • James's library contains reference, biography, and fiction books only, in the ratio of 1:2:7, respectively.
    • In James’s library, there are 30 books in total.

To find:
    • The number of biographies that James owns.

Approach and Working:
As the ratio of reference, biography and friction is 1: 2: 7, the number of biographies = \(30 * \frac{2}{1+2+7} = 30 * \frac{2}{10} = 6\)
Hence, the correct answer is option D.

Answer: D

Image

_________________
Manager
Manager
User avatar
B
Joined: 14 Feb 2016
Posts: 71
Re: James's library contains reference, biography, and fiction books only,  [#permalink]

Show Tags

New post 28 Dec 2018, 12:20
Employ the unknown multiplier technique in this case to find that x = 3.

7x + 2x + 1x = 30
x = 3

2(3) = 6

So 6 biographies.
_________________
Please provide kudos if you liked my post! I would really like to use the PDF file!!
GMAT Club Bot
Re: James's library contains reference, biography, and fiction books only,   [#permalink] 28 Dec 2018, 12:20
Display posts from previous: Sort by

James's library contains reference, biography, and fiction books only,

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne