It is currently 13 Dec 2017, 09:16

Decision(s) Day!:

CHAT Rooms | Ross R1 | Kellogg R1 | Darden R1 | Tepper R1


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

Three pounds of 05 grass seed contain 5 percent herbicide. A different

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

Hide Tags

Intern
Intern
avatar
Joined: 10 Dec 2012
Posts: 1

Kudos [?]: 1 [0], given: 2

GMAT ToolKit User
Three pounds of 05 grass seed contain 5 percent herbicide. A different [#permalink]

Show Tags

New post 19 Oct 2014, 11:07
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

81% (01:24) correct 19% (03:49) wrong based on 117 sessions

HideShow timer Statistics

Three pounds of 05 grass seed contain 5 percent herbicide. A different type of grass seed, 20, which contains 20 percent herbicide, will be mixed with three pounds of 05 grass seed. How much grass seed of type 20 should be added to the three pounds of 05 grass seed so that the mixture contains 15 percent herbicide?

A. 3
B. 3.75
C. 4.5
D. 6
E. 9
[Reveal] Spoiler: OA

Last edited by Bunuel on 19 Oct 2014, 11:16, edited 1 time in total.
Renamed the topic and edited the question.

Kudos [?]: 1 [0], given: 2

3 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 13 Jun 2013
Posts: 278

Kudos [?]: 487 [3], given: 13

Premium Member
Re: Three pounds of 05 grass seed contain 5 percent herbicide. A different [#permalink]

Show Tags

New post 19 Oct 2014, 12:35
3
This post received
KUDOS
zadi wrote:
Three pounds of 05 grass seed contain 5 percent herbicide. A different type of grass seed, 20, which contains 20 percent herbicide, will be mixed with three pounds of 05 grass seed. How much grass seed of type 20 should be added to the three pounds of 05 grass seed so that the mixture contains 15 percent herbicide?

A. 3
B. 3.75
C. 4.5
D. 6
E. 9


05 grass seed contains 5% herbicide and its amount is 3 pound
20 grass seed contains 20% herbicide and its amount is x

when these two types of grass seeds are mixed, their average becomes 15%

thus we have
3(5)+x(20)/(x+3) = 15

15+20x=15x +45
5x=30
or x=6

Kudos [?]: 487 [3], given: 13

Expert Post
2 KUDOS received
Veritas Prep GMAT Instructor
User avatar
G
Joined: 16 Oct 2010
Posts: 7792

Kudos [?]: 18112 [2], given: 236

Location: Pune, India
Re: Three pounds of 05 grass seed contain 5 percent herbicide. A different [#permalink]

Show Tags

New post 19 Oct 2014, 20:24
2
This post received
KUDOS
Expert's post
1
This post was
BOOKMARKED
zadi wrote:
Three pounds of 05 grass seed contain 5 percent herbicide. A different type of grass seed, 20, which contains 20 percent herbicide, will be mixed with three pounds of 05 grass seed. How much grass seed of type 20 should be added to the three pounds of 05 grass seed so that the mixture contains 15 percent herbicide?

A. 3
B. 3.75
C. 4.5
D. 6
E. 9


Using weighted averages:

5% herbicide seed mixed with 20% herbicide seed to give 15% herbicide seed.

w1/w2 = (20 - 15)/(15 - 5) = 1/2

So 1 part of 5% was mixed with 2 parts of 20%.
Since 5% herbicide seed was 3 pounds, 20% herbicide seed must have been 6 pounds.

Answer (D)
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Kudos [?]: 18112 [2], given: 236

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 14872

Kudos [?]: 287 [0], given: 0

Premium Member
Re: Three pounds of 05 grass seed contain 5 percent herbicide. A different [#permalink]

Show Tags

New post 27 Oct 2017, 10:45
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

Kudos [?]: 287 [0], given: 0

1 KUDOS received
VP
VP
avatar
P
Joined: 22 May 2016
Posts: 1122

Kudos [?]: 401 [1], given: 644

Three pounds of 05 grass seed contain 5 percent herbicide. A different [#permalink]

Show Tags

New post 27 Oct 2017, 12:31
1
This post received
KUDOS
zadi wrote:
Three pounds of 05 grass seed contain 5 percent herbicide. A different type of grass seed, 20, which contains 20 percent herbicide, will be mixed with three pounds of 05 grass seed. How much grass seed of type 20 should be added to the three pounds of 05 grass seed so that the mixture contains 15 percent herbicide?

A. 3
B. 3.75
C. 4.5
D. 6
E. 9

Weighted average as well, a slightly different version.*

The formula below makes it easier for me to see two mixtures with different concentrations and/or volumes are added to create a third, resultant, mixture with its concentration and volume.

A = mixture with .05 herbicide
x = mixture with .20 herbicide

We have 3 pounds of A.

.05(3) + .20(x) = .15(3 + x)
5(3) + 20x = 15(3 + x)
15 + 20x = 45 + 15x
5x = 30
x = 6

Answer D
*\((Concen_A)(Vol_A) + (Con_B)(Vol_B) = (Con_{A+B})(Vol_{A+B})\)

Kudos [?]: 401 [1], given: 644

Three pounds of 05 grass seed contain 5 percent herbicide. A different   [#permalink] 27 Oct 2017, 12:31
Display posts from previous: Sort by

Three pounds of 05 grass seed contain 5 percent herbicide. A different

  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®.