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

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The contents of a bag of marbles consist of 9 green marbles [#permalink] New post 16 Mar 2012, 03:24
00:00
A
B
C
D
E

Difficulty:

  25% (low)

Question Stats:

68% (02:04) correct 32% (01:22) wrong based on 165 sessions
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

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Last edited by Bunuel on 16 Mar 2012, 03:35, edited 1 time in total.
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Re: The contents of a bag of marbles consist of 9 green marbles [#permalink] New post 21 Aug 2012, 10:14
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I just set it up like this.

9/X marbles = .60 ==> solve for x equals 15 marbles. 25-10 = 15.
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Re: Number of green marbles [#permalink] New post 16 Mar 2012, 03:34
Expert's post
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.

Answer: E.

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Re: The contents of a bag of marbles consist of 9 green marbles [#permalink] New post 16 Mar 2012, 06:13
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.

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Re: The contents of a bag of marbles consist of 9 green marbles [#permalink] New post 02 Jun 2012, 03:00
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Re: The contents of a bag of marbles consist of 9 green marbles [#permalink] New post 20 Sep 2013, 09:53
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Re: The contents of a bag of marbles consist of 9 green marbles [#permalink] New post 22 Sep 2013, 19:38
9 green, 16 blue = 25 marbles
60% = 9 marbles , 100% = 15 marbles
so in 15 9 green and 10 blue
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Re: The contents of a bag of marbles consist of 9 green marbles [#permalink] New post 23 Sep 2013, 06:40
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.
Re: The contents of a bag of marbles consist of 9 green marbles   [#permalink] 23 Sep 2013, 06:40
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