Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 25 May 2017, 14:52

### 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

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 June
Open Detailed Calendar

# The contents of a bag of marbles consist of 9 green marbles

Author Message
TAGS:

### Hide Tags

Director
Status: Finally Done. Admitted in Kellogg for 2015 intake
Joined: 25 Jun 2011
Posts: 537
Location: United Kingdom
GMAT 1: 730 Q49 V45
GPA: 2.9
WE: Information Technology (Consulting)
Followers: 77

Kudos [?]: 3379 [0], given: 217

The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

16 Mar 2012, 04:24
2
This post was
BOOKMARKED
00:00

Difficulty:

25% (medium)

Question Stats:

68% (02:08) correct 32% (01:18) wrong based on 241 sessions

### HideShow timer Statistics

The contents of a bag of marbles consist of 9 green marbles and 16 blue marbles. How many blue marbles must be removed so that 60% of the marbles in the bag will be green?

(A) 1
(B) 6
(C) 7
(D) 9
(E) 10

Relatively easy question and I think I have a problem with the concept. Can someone please explain?
[Reveal] Spoiler: OA

_________________

Best Regards,
E.

MGMAT 1 --> 530
MGMAT 2--> 640
MGMAT 3 ---> 610
GMAT ==> 730

Last edited by Bunuel on 16 Mar 2012, 04:35, edited 1 time in total.
Edited the OA
Math Expert
Joined: 02 Sep 2009
Posts: 38881
Followers: 7733

Kudos [?]: 106125 [0], given: 11607

Re: Number of green marbles [#permalink]

### Show Tags

16 Mar 2012, 04:34
enigma123 wrote:
The contents of a bag of marbles consist of 9 green marbles and 16 blue marbles. How many blue marbles must be removed so that 60% of the marbles in the bag will be green?

(A) 1
(B) 6
(C) 7
(D) 9
(E) 10

Relatively easy question and I think I have a problem with the concept. Can someone please explain?

Say we remove x blue marbles, so there will be 9+16-x marbles in the bag. We want 9 green marbles to compose 60% of this number: 0.6(9+16-x)=9 --> x=10.

_________________
Manager
Joined: 21 Sep 2011
Posts: 112
Concentration: Entrepreneurship, General Management
GMAT 1: 530 Q42 V20
GMAT 2: 540 Q43 V28
GMAT 3: 680 Q48 V35
WE: Business Development (Hospitality and Tourism)
Followers: 2

Kudos [?]: 14 [0], given: 18

Re: The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

16 Mar 2012, 07:13
We have 9 green and 16 blue marbles.

60% = 9 green marbles
rest 40% = 6, which needs to blue marbles.

6 should be in the bag, so we need to remove 10 marbles.

IMO E.
_________________

KUDOS - if my post has helped you.

Moderator
Joined: 01 Sep 2010
Posts: 3173
Followers: 856

Kudos [?]: 7305 [0], given: 1065

Re: The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

02 Jun 2012, 04:00
A bit of logic.

9G + 16B = 25

60% of 25 = 15

To have our 15 we have to cut the B and to have 6 to obtain 15. The difference is 10. E is the answer
_________________
Intern
Joined: 06 Aug 2012
Posts: 1
Followers: 0

Kudos [?]: 1 [1] , given: 6

Re: The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

21 Aug 2012, 11:14
1
KUDOS
I just set it up like this.

9/X marbles = .60 ==> solve for x equals 15 marbles. 25-10 = 15.
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15444
Followers: 649

Kudos [?]: 209 [0], given: 0

Re: The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

20 Sep 2013, 10:53
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.
_________________
Senior Manager
Joined: 25 Mar 2013
Posts: 276
Location: United States
Concentration: Entrepreneurship, Marketing
GPA: 3.5
Followers: 3

Kudos [?]: 29 [0], given: 101

Re: The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

22 Sep 2013, 20:38
9 green, 16 blue = 25 marbles
60% = 9 marbles , 100% = 15 marbles
so in 15 9 green and 10 blue
_________________

I welcome analysis on my posts and kudo +1 if helpful. It helps me to improve my craft.Thank you

Intern
Joined: 09 Mar 2010
Posts: 39
Concentration: Technology, General Management
Schools: McCombs '14
Followers: 0

Kudos [?]: 17 [0], given: 17

Re: The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

23 Sep 2013, 07:40
I Just did it this way,
Since the bag should contain 60% green marbles and rest Blue Marbles,

x/(9+16) = 60% ==> x= 15 ==> 9+ 6 , so 10 blue marbles will be removed.
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15444
Followers: 649

Kudos [?]: 209 [0], given: 0

Re: The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

21 Jan 2015, 07:35
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.
_________________
EMPOWERgmat Instructor
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 9116
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: 340 Q170 V170
Followers: 443

Kudos [?]: 2869 [0], given: 169

Re: The contents of a bag of marbles consist of 9 green marbles [#permalink]

### Show Tags

21 Jan 2015, 20:33
Hi All,

This question is rooted in basic arithmetic. Since the question asks how many marbles need to be removed and the answers ARE numbers, we can TEST THE ANSWERS until we find the one that "fits."

To start, we have a bag of marbles....
9 green
16 blue
25 total

We're asked to remove blue marbles until the green marbles make up 60% of the bag....

Right now, green marbles make up 9/25 = 36% of the bag, so we clearly need to remove a bunch of blue marbles to change this percentage. Looking at the answers, I'd TEST one of the larger options first...

Let's TEST D....

IF 9 blue marbles were removed, then we'd have...
9 green
7 blue
16 total
9/16 is NOT 60% exactly, but it's pretty close....

Let's TEST E...

IF 10 blue marbles were removed, then we'd have...
9 green
6 blue
15 total
9/15 IS 60%, so this MUST be the answer!

[Reveal] Spoiler:
E

GMAT assassins aren't born, they're made,
Rich
_________________

760+: Learn What GMAT Assassins Do to Score at the Highest Levels
Contact Rich at: Rich.C@empowergmat.com

# Rich Cohen

Co-Founder & GMAT Assassin

# Special Offer: Save $75 + GMAT Club Tests 60-point improvement guarantee www.empowergmat.com/ ***********************Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!*********************** EMPOWERgmat Instructor Status: GMAT Assassin/Co-Founder Affiliations: EMPOWERgmat Joined: 19 Dec 2014 Posts: 9116 Location: United States (CA) GMAT 1: 800 Q51 V49 GRE 1: 340 Q170 V170 Followers: 443 Kudos [?]: 2869 [0], given: 169 Re: The contents of a bag of marbles consist of 9 green marbles [#permalink] ### Show Tags 21 Jan 2015, 20:33 Hi All, This question is rooted in basic arithmetic. Since the question asks how many marbles need to be removed and the answers ARE numbers, we can TEST THE ANSWERS until we find the one that "fits." To start, we have a bag of marbles.... 9 green 16 blue 25 total We're asked to remove blue marbles until the green marbles make up 60% of the bag.... Right now, green marbles make up 9/25 = 36% of the bag, so we clearly need to remove a bunch of blue marbles to change this percentage. Looking at the answers, I'd TEST one of the larger options first... Let's TEST D.... IF 9 blue marbles were removed, then we'd have... 9 green 7 blue 16 total 9/16 is NOT 60% exactly, but it's pretty close.... Let's TEST E... IF 10 blue marbles were removed, then we'd have... 9 green 6 blue 15 total 9/15 IS 60%, so this MUST be the answer! Final Answer: [Reveal] Spoiler: E GMAT assassins aren't born, they're made, Rich _________________ 760+: Learn What GMAT Assassins Do to Score at the Highest Levels Contact Rich at: Rich.C@empowergmat.com # Rich Cohen Co-Founder & GMAT Assassin # Special Offer: Save$75 + GMAT Club Tests

60-point improvement guarantee
www.empowergmat.com/

***********************Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!***********************

Re: The contents of a bag of marbles consist of 9 green marbles   [#permalink] 21 Jan 2015, 20:33
Similar topics Replies Last post
Similar
Topics:
4 A bag contains blue, red and green marbles only. 3 29 Oct 2016, 11:16
1 A bag consists of 20 marbles, of which 5 are blue, 9 are red, and the 4 02 Oct 2016, 06:28
1 A bag holds 2 red marbles and 3 green marbles. If you removed two rand 3 11 Apr 2016, 00:33
17 A bag contains ten marbles of the same size: 3 are identical green mar 11 08 May 2017, 21:14
1 A bag contains 6 red marbles,9 blue marbles,and 5 green marbles.You wi 2 25 Aug 2010, 20:21
Display posts from previous: Sort by