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

It is currently 23 Jun 2018, 03:29

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

Seed mixture X is 40 percent ryegrass and 60 percent

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Retired Moderator
User avatar
Joined: 18 Jul 2008
Posts: 902
Seed mixture X is 40 percent ryegrass and 60 percent [#permalink]

Show Tags

New post 29 Oct 2008, 19:36
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of this mixture is X ?
(A) 10%
(B) 33.33 %
(C) 40%
(D) 50%
(E) 66.66 %


Anyone try the plug in number method for this one?

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Director
Director
avatar
Joined: 14 Aug 2007
Posts: 695
Re: PS: Seed Mixture [#permalink]

Show Tags

New post 29 Oct 2008, 20:01
bigfernhead wrote:
Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of this mixture is X ?
(A) 10%
(B) 33.33 %
(C) 40%
(D) 50%
(E) 66.66 %

Anyone try the plug in number method for this one?


2/5x + 1/4y = 3/10(x+y)
0.4x - 0.3x = 0.3y - 0.25y
0.1x = 0.05y
x = 1/2y
2x = y

so (x+y) = 3x
x/3x = 1/3 = 0.3333 = 33.33%
Director
Director
avatar
Joined: 23 May 2008
Posts: 743
Re: PS: Seed Mixture [#permalink]

Show Tags

New post 29 Oct 2008, 21:00
its always easier for me to use a chart....
Attachments

Book2.xls [13.5 KiB]
Downloaded 99 times

To download please login or register as a user

Retired Moderator
User avatar
Joined: 18 Jul 2008
Posts: 902
Re: PS: Seed Mixture [#permalink]

Show Tags

New post 30 Oct 2008, 06:24
Yup, that's why I did as well. But then I tried to plug in numbers insteds for x and y, but couldn't get anything to resemble 33%

bigtreezl wrote:
its always easier for me to use a chart....
Retired Moderator
User avatar
Joined: 18 Jul 2008
Posts: 902
Re: PS: Seed Mixture [#permalink]

Show Tags

New post 03 Nov 2008, 08:39
^bump. Anyone try pluggin in numbers?
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3292
Location: New York City
Schools: Wharton'11 HBS'12
Re: PS: Seed Mixture [#permalink]

Show Tags

New post 03 Nov 2008, 08:49
bigfernhead wrote:
Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of this mixture is X ?
(A) 10%
(B) 33.33 %
(C) 40%
(D) 50%
(E) 66.66 %
Anyone try the plug in number method for this one?


.4X+0.25y=0.3(x+y)
0.1x=0.05y
x=0.05/0.1 or x=0.5y, then 0.5/1.5 or 5/15 *100 or 33.33%
Manager
Manager
avatar
Joined: 12 Oct 2008
Posts: 100
Re: PS: Seed Mixture [#permalink]

Show Tags

New post 03 Nov 2008, 09:09
bigfernhead wrote:
^bump. Anyone try pluggin in numbers?


there's no need for that.

amount of weaker mix*(new mix-weaker mix)=amount of stronger mix *(stronger mix-new mix)
y*(30-25)=x*(40-10)
5y=10x
y=2x

So, if total weight is 300, x is 100, which is 1/3, or 33.33%

there's no need to plug in no's, or even use decimals (I always mess up adding or multiplying them :? ) It's all about proportions

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: PS: Seed Mixture   [#permalink] 03 Nov 2008, 09:09
Display posts from previous: Sort by

Seed mixture X is 40 percent ryegrass and 60 percent

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


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®.