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

 It is currently 16 Dec 2018, 07:13

### 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

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### Free GMAT Prep Hour

December 16, 2018

December 16, 2018

03:00 PM EST

04:00 PM EST

Strategies and techniques for approaching featured GMAT topics
• ### FREE Quant Workshop by e-GMAT!

December 16, 2018

December 16, 2018

07:00 AM PST

09:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.

# M25-21

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

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 51227
M25-21  [#permalink]

### Show Tags

16 Sep 2014, 00:23
1
5
00:00

Difficulty:

5% (low)

Question Stats:

82% (01:08) correct 18% (00:58) wrong based on 295 sessions

### HideShow timer Statistics

In a certain collection of books there are 30 books in hard cover that contain more than 100 pages. If 15 percent of the books that contain more than 100 pages are in hard cover, how many books contain more than 100 pages but are not in hard cover?

A. 60
B. 90
C. 170
D. 180
E. 200

_________________
Math Expert
Joined: 02 Sep 2009
Posts: 51227
Re M25-21  [#permalink]

### Show Tags

16 Sep 2014, 00:23
Official Solution:

In a certain collection of books there are 30 books in hard cover that contain more than 100 pages. If 15 percent of the books that contain more than 100 pages are in hard cover, how many books contain more than 100 pages but are not in hard cover?

A. 60
B. 90
C. 170
D. 180
E. 200

15 percent of all books that contain more than 100 pages = 30. Hence, there are in all $$\frac{30}{15}*100 = 200$$ books that contain more than 100 pages. Of these 200 books, 30 are in hard cover. Therefore, $$200 - 30 = 170$$ books that contain more than 100 pages but are not in hard cover.

Answer: C
_________________
Director
Joined: 11 Feb 2015
Posts: 617
Re: M25-21  [#permalink]

### Show Tags

26 Jun 2018, 08:35
It is given that 30 books are in hard cover that contain more than 100 pages. Using this information and knowing that this constitutes 15 percent, we can find the total books as 30 divided by 15% will give us the total books = 200 books. We can subtract the 30 from 200 to get the final answer as 170; i.e. the number books contain more than 100 pages but are not in hard cover:-

Attachment:

2018-06-26_22-00-08.jpg [ 32.33 KiB | Viewed 1547 times ]

_________________

"Please hit +1 Kudos if you like this post"

_________________
Manish

"Only I can change my life. No one can do it for me"

Manager
Joined: 12 Dec 2015
Posts: 132
Re: M25-21  [#permalink]

### Show Tags

26 Jun 2018, 13:30
In a certain collection of books there are 30 books in hard cover that contain more than 100 pages. If 15 percent of the books that contain more than 100 pages are in hard cover, how many books contain more than 100 pages but are not in hard cover?

A. 60
B. 90
C. 170
D. 180
E. 200

Ans: C
T*15% = h
=> (h+s)*15% = h
=> (30+s)*15/100 = 30
=> 30+s = 200
=> s = 170
Re: M25-21 &nbs [#permalink] 26 Jun 2018, 13:30
Display posts from previous: Sort by

# M25-21

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

Moderators: chetan2u, Bunuel

 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®.