Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

It is currently 17 Jul 2019, 04:02

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

20 books, each on a different subject, are placed on a shelf

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

Hide Tags

Find Similar Topics 
Retired Moderator
avatar
P
Joined: 22 Aug 2013
Posts: 1435
Location: India
20 books, each on a different subject, are placed on a shelf  [#permalink]

Show Tags

New post 24 Feb 2018, 00:12
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

60% (01:53) correct 40% (01:52) wrong based on 40 sessions

HideShow timer Statistics


20 books, each on a different subject, are placed on a shelf from left to right. The books are labelled numerically from '1' to '20' respectively in increasing order from left to right, such that the leftmost book is labelled number '1' while the rightmost book is labelled number '20'. Out of these 20 books, there is also a Physics book, a Mathematics book and a Philosophy book. What is the label number on the Mathematics book?

(1) Exactly 1 book is placed between the Physics book and the Philosophy book, while exactly 2 books are placed between the Philosophy book and the Mathematics book. Physics book has label number '15'.

(2) Philosophy book has label number '17'.
examPAL Representative
User avatar
P
Joined: 07 Dec 2017
Posts: 1074
20 books, each on a different subject, are placed on a shelf  [#permalink]

Show Tags

New post 24 Feb 2018, 02:59
amanvermagmat wrote:
20 books, each on a different subject, are placed on a shelf from left to right. The books are labelled numerically from '1' to '20' respectively in increasing order from left to right, such that the leftmost book is labelled number '1' while the rightmost book is labelled number '20'. Out of these 20 books, there is also a Physics book, a Mathematics book and a Philosophy book. What is the label number on the Mathematics book?

(1) Exactly 1 book is placed between the Physics book and the Philosophy book, while exactly 2 books are placed between the Philosophy book and the Mathematics book. Physics book has label number '15'.

(2) Philosophy book has label number '17'.


We'll use a drawing to help us understand the different arrangements.
This is an Alternative approach.

(1) So, putting the math book on different sides of the philosophy book we can have
15:Physics 16:? 17:Philosophy 18:? 19:? 20:Math or
14:Math 15:Physics 16:? 17:Philosophy.
Insufficient!

(2) This is clearly insufficient as it says nothing about the math book.
Insufficient!

Combined:
We still can't separate between the two options given above.
Insufficient.

(E) is our answer
_________________
GMAT Club Bot
20 books, each on a different subject, are placed on a shelf   [#permalink] 24 Feb 2018, 02:59
Display posts from previous: Sort by

20 books, each on a different subject, are placed on a shelf

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





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