It is currently 19 Nov 2017, 05:35

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A collection of books went on sale, 4/5 of which were sold at $6.40 ea

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

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42247

Kudos [?]: 132657 [0], given: 12331

A collection of books went on sale, 4/5 of which were sold at $6.40 ea [#permalink]

Show Tags

New post 28 Sep 2017, 01:50
Expert's post
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

100% (00:47) correct 0% (00:00) wrong based on 32 sessions

HideShow timer Statistics

A collection of books went on sale, 4/5 of which were sold at $6.40 each. If none of the remaining 25 books were sold, what was the total received for the books that were sold?

A. $100
B. $160
C. $320
D. $480
E. $640
[Reveal] Spoiler: OA

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 132657 [0], given: 12331

Senior Manager
Senior Manager
User avatar
G
Joined: 02 Jul 2017
Posts: 269

Kudos [?]: 80 [0], given: 65

Location: India
GMAT ToolKit User CAT Tests
Re: A collection of books went on sale, 4/5 of which were sold at $6.40 ea [#permalink]

Show Tags

New post 28 Sep 2017, 02:02
A collection of books went on sale, 4/5 of which were sold at $6.40 each. If none of the remaining 25 books were sold, what was the total received for the books that were sold?

Let total number of books = x

4/5 of x sold at $6.40 each. => revenue = 4x/5 * 6.4

remaining books = 1/5 of x = 25 => 1/5 * x = 25 => x= 125

So total revenue = (4* 125 /5) * 6.4 = $ 640

Answer: E

Kudos [?]: 80 [0], given: 65

Director
Director
avatar
P
Joined: 22 May 2016
Posts: 979

Kudos [?]: 337 [0], given: 591

A collection of books went on sale, 4/5 of which were sold at $6.40 ea [#permalink]

Show Tags

New post 28 Sep 2017, 13:40
Bunuel wrote:
A collection of books went on sale, 4/5 of which were sold at $6.40 each. If none of the remaining 25 books were sold, what was the total received for the books that were sold?

A. $100
B. $160
C. $320
D. $480
E. $640

Total received =
(# of books sold) * (price per book)

1) Number of books total?

Fraction of all books not sold: \(\frac{1}{5}\)
Number of all books not sold = 25

\(\frac{1}{5}\) of all books = \(25\)
All books = \(25 *\frac{5}{1} = 125\)

2) Total books sold?*

(All books) - (# not sold) = (# sold)
(125 - 25) = 100 books sold

3) Total money received?

100 books * $6.40 per book = $640

Answer E

*You can combine steps to find total books sold.

\(\frac{PartUnsold}{#Unsold} = \frac{PartSold}{#Sold}\)

\(\frac{\frac{1}{5}}{25} = \frac{\frac{4}{5}}{?}\)

Numerator is multiplied by 4. Do the same to the denominator: 25 * 4 = 100 sold. Or cross multiply

Kudos [?]: 337 [0], given: 591

Intern
Intern
User avatar
B
Joined: 05 Mar 2017
Posts: 6

Kudos [?]: 9 [0], given: 8

Re: A collection of books went on sale, 4/5 of which were sold at $6.40 ea [#permalink]

Show Tags

New post 28 Sep 2017, 15:42
If \(\frac{4}{5}\) were sold then \(\frac{1}{5}\) were not sold.

According to the post, 25 remained unsold, meaning 25=\(\frac{1}{5}\) of the total books. 25 x 4 (portion of books that were sold)= 100 x 6.40= 640

Answer E

Kudos [?]: 9 [0], given: 8

Expert Post
Target Test Prep Representative
User avatar
S
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 1684

Kudos [?]: 902 [0], given: 5

Re: A collection of books went on sale, 4/5 of which were sold at $6.40 ea [#permalink]

Show Tags

New post 03 Oct 2017, 10:03
Bunuel wrote:
A collection of books went on sale, 4/5 of which were sold at $6.40 each. If none of the remaining 25 books were sold, what was the total received for the books that were sold?

A. $100
B. $160
C. $320
D. $480
E. $640


Since 25 books represents the remaining 1/5 of the books, there were originally 5 x 25 = 125 books.

Thus, 4/5 x 125 = 100 books were sold for $6.40 each, so $640 was made on the sale of those books.

Answer: E
_________________

Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Kudos [?]: 902 [0], given: 5

Re: A collection of books went on sale, 4/5 of which were sold at $6.40 ea   [#permalink] 03 Oct 2017, 10:03
Display posts from previous: Sort by

A collection of books went on sale, 4/5 of which were sold at $6.40 ea

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


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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

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®.