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

It is currently 20 Jun 2018, 15:29
Search
Register
GMAT Club Tests
Decision Tracker
My Rewards
New posts
Unanswered

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.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar
CLICK HERE TO HIDE/SHOW EVENTS

A portion of the 85% solution of chemicals was replaced with

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
  Sort by Date Sort by Kudos  
Search for:
 

Go to page   Previous    1   2   [ 26 posts ] 

Print view
First unread post
Author Message
TAGS:

Hide Tags
Current Student
User avatar
Joined: 05 Jul 2016
Posts: 48
Location: China
Concentration: Finance, Nonprofit
Schools: Duke '19 (D), Marshall '19 (D), McDonough '19 (A), Boston U '19 (A), Carroll '19 (WL), Mason '18 (A)
GMAT 1: 680 Q49 V33
GMAT 2: 690 Q51 V31
GMAT 3: 710 Q50 V36
GPA: 3.4
Re: A portion of the 85% solution of chemicals was replaced with [#permalink]

Show Tags

New post 24 Jul 2016, 03:03
we could just consider "weight" issue and establish "weight" equation:

(1-N)*(85-40)+N*(20-40)=0
N=9/13
_________________

It's better to burn out than to fade away.

Expert Post
SVP
SVP
User avatar
P
Joined: 08 Jul 2010
Posts: 2114
Location: India
GMAT: INSIGHT
WE: Education (Education)
Reviews Badge
Re: A portion of the 85% solution of chemicals was replaced with [#permalink]

Show Tags

New post 29 Aug 2016, 10:38
1
bmwhype2 wrote:
A portion of the 85% solution of chemicals was replaced with an equal amount of 20% solution of chemicals. As a result, 40% solution of chemicals resulted. What part of the original solution was replaced?

A. 5/13
B. 6/13
C. 9/13
D. 13/9
C. 13/6


Please find the solution as attached.
Attachments

File comment: www.GMATinsight.com
Sol7.jpg
Sol7.jpg [ 111.92 KiB | Viewed 548 times ]


_________________

Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION

Senior Manager
Senior Manager
User avatar
Joined: 11 Nov 2014
Posts: 344
Location: India
Concentration: Finance, International Business
Schools: LBS '18, ISB '18, NUS '18, NTU '18, Great Lakes '18, SPJ PGPM"17
WE: Project Management (Telecommunications)
GMAT ToolKit User Premium Member
Re: A portion of the 85% solution of chemicals was replaced with [#permalink]

Show Tags

New post 20 Sep 2016, 07:35
I got 9/17
not sure why,

experts please help
Attachments

46fe73cb-3213-4b92-8d3e-bc3e1ef3b00a.jpg
46fe73cb-3213-4b92-8d3e-bc3e1ef3b00a.jpg [ 95.21 KiB | Viewed 501 times ]

Current Student
User avatar
B
Status: DONE!
Joined: 05 Sep 2016
Posts: 398
Re: A portion of the 85% solution of chemicals was replaced with [#permalink]

Show Tags

New post 24 Sep 2016, 19:48
0.85(1-x) + 0.20x = 0.40
0.85 -0.85x + 0.20x = 0.40
-0.65x = -0.45 --> x = 9/13
Manager
Manager
avatar
B
Joined: 09 Aug 2016
Posts: 68
A portion of the 85% solution of chemicals was replaced with [#permalink]

Show Tags

New post 22 Dec 2016, 05:41
KillerSquirrel wrote:

the new ratio is 20:45 = 4:9 ---> meaning that if we had 13ml of 85% solution we now have only 4ml so the part that was replaced is 9/13.

:)


Thanks for the solution but can somebody explain the logic step by step and slowly?

the new ratio is 20:45 = 4:9 ---> meaning that if we had 13ml [ 4x + 9x = 13 and for the sake of the solution x = 1 hence 13 ml ] of 85% solution

[13ml of 85% solution .... what someone should understand by this. If someone tries to find the 0.85 of 13 it will not get int value] we now have only 4ml [how this magic 4 came up] so the part that was replaced is 9/13. [by now totally lost]
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 7009
Premium Member
Re: A portion of the 85% solution of chemicals was replaced with [#permalink]

Show Tags

New post 04 Feb 2018, 14:16
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: A portion of the 85% solution of chemicals was replaced with   [#permalink] 04 Feb 2018, 14:16
Print view
First unread post

Go to page   Previous    1   2   [ 26 posts ] 

Display posts from previous: Sort by

A portion of the 85% solution of chemicals was replaced with

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

Moderators: chetan2u, VeritasPrepKarishma, Bunuel, niks18, mikemcgarry, generis

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions