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

It is currently 19 Apr 2019, 09:38

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

M08-37

  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: 54371
M08-37  [#permalink]

Show Tags

New post 16 Sep 2014, 00:38
2
1
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

82% (00:50) correct 18% (01:28) wrong based on 88 sessions

HideShow timer Statistics

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 54371
Re M08-37  [#permalink]

Show Tags

New post 16 Sep 2014, 00:38
1
Official Solution:

If 160 kg of dry wood pulp is needed to produce 50 sheets of paper, how much raw pulp will be needed to produce 200 sheets of paper if raw pulp loses 20 percent of its weight during desiccation?

A. 400
B. 600
C. 640
D. 800
E. 850


Let \(X\) denote the required amount of raw pulp. \(X\) kg of raw pulp will turn into \(0.8X\) kg of dry pulp after desiccation. Compose a proportion:

\(\frac{0.8X}{200} = \frac{160}{50}\), so \(X = 800\).


Answer: D
_________________
Intern
Intern
avatar
B
Joined: 28 May 2014
Posts: 31
Schools: ISB '17, NUS '17
M08-37  [#permalink]

Show Tags

New post 09 Aug 2016, 14:49
i took 80% of 160/50 (per sheet require pulp) and then multiplied it with 200. Whats wrong with this method Bunuel?
Intern
Intern
avatar
Joined: 12 Jul 2016
Posts: 3
Re: M08-37  [#permalink]

Show Tags

New post 11 Aug 2016, 07:00
I did this at first too but notice the key word in the question is dry: 160 kg of DRY wood. Therefore, you have to determine how much raw wood was used to create the 50 sheets.

if 160 is after the reduction, then 160=x-.2x or 160=.8x. Therefore 200kg raw wood creates 50 sheets. Multiply by 4 to obtain amount for 200 sheets and you receive answer D, 800.
Intern
Intern
avatar
Joined: 28 Dec 2016
Posts: 2
M08-37  [#permalink]

Show Tags

New post 02 Jul 2017, 12:40
I took up too much time on an easy question doing it by hand, but I felt at the moment I needed to get this right.

I calculated 160kg (DRY)/50sheets = 3.2kg (DRY) per sheet

1.2*(3.2kg (DRY) per sheet) = 3.84kg (RAW) per sheet

then just multiply by 200 sheets ~=800 kg RAW

(All CAPS to over emphasize in my head so that I don't get mixed up along the way).
GMAT Club Bot
M08-37   [#permalink] 02 Jul 2017, 12:40
Display posts from previous: Sort by

M08-37

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

Moderators: chetan2u, Bunuel



cron
Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| 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®.