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Bonny grows only pink parrots and green parrots. He grows

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Re: Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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New post 12 Feb 2012, 04:36
5
12
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

69% (04:17) correct 31% (03:17) wrong based on 165 sessions

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happycreck1 wrote:
Bonny grows only pink parrots and green parrots. He grows three times as many green parrots as pink parrots. He feeds his parrots either soy beans or wheat, but no single parrot feeds on both kinds of food. Half of the parrots that feed on soy beans are green, and among the pink parrots, those that feed on soy beans are twice as many as those that feed on wheat. If 40 of Bonny’s parrots feed on wheat, how many of the wheat feeding parrots are green?

A. 15
B. 30
C. 35
D. 45

HI
Please help me to solve this question am stuck..


It seems that this question is not from GMAT sources as it has only 4 answer choices instead of 5. Anyway, the easiest way to solve it would be to fill a double set matrix step by step:
Attachment:
Parrots.PNG
Parrots.PNG [ 4.02 KiB | Viewed 4052 times ]
Notice, that we have two equations: y+y/2=x and x+3x=2y+40 --> solve for x and y --> x=15 and y=10 --> ?=35.

Check solved matrix:
Attachment:
Parrots - Solution.PNG
Parrots - Solution.PNG [ 3.7 KiB | Viewed 4046 times ]
Answer: C.

Hope it's clear.

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Re: Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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New post 18 Aug 2013, 10:32
Attached solution:

Since the 2X is given as 40

2X=40

X=20

Hence,

7X/4 = 35
Attachments

Solution.JPG
Solution.JPG [ 18.15 KiB | Viewed 3411 times ]


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Re: Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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New post 18 Aug 2013, 11:21
Bunuel wrote:
happycreck1 wrote:
Bonny grows only pink parrots and green parrots. He grows three times as many green parrots as pink parrots. He feeds his parrots either soy beans or wheat, but no single parrot feeds on both kinds of food. Half of the parrots that feed on soy beans are green, and among the pink parrots, those that feed on soy beans are twice as many as those that feed on wheat. If 40 of Bonny’s parrots feed on wheat, how many of the wheat feeding parrots are green?

A. 15
B. 30
C. 35
D. 45

HI
Please help me to solve this question am stuck..


It seems that this question is not from GMAT sources as it has only 4 answer choices instead of 5. Anyway, the easiest way to solve it would be to fill a double set matrix step by step:
Attachment:
Parrots.PNG
Notice, that we have two equations: y+y/2=x and x+3x=2y+40 --> solve for x and y --> x=15 and y=10 --> ?=35.

Check solved matrix:
Attachment:
Parrots - Solution.PNG
Answer: C.

Hope it's clear.



it's a kaplan tastes math ,.


food ! green ! pink ! total
..............................................!............................!...................................
soy ! s/2 ! 2y ! S
................. !..........................!.............................!....................................
wheat ! 3x-2y ! y ! 40
...................!.........................!.............................!.................................
total ! 3x ! x !
...................!.........................!.............................!...................................

3x-y = 40
3y=x
So, x=15 and y = 5

Now, 3x-2y = 45-10 = 35 (Answer C)
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Re: Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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New post 09 Jun 2014, 05:44
I think statement is confusing : among the pink parrots, those that feed on soy beans are twice as many as those that feed on wheat.

Second those is ambiguous whether it refers to all parrots or pink parrots.
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Re: Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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New post 09 Jul 2014, 19:19
Bunuel wrote:
happycreck1 wrote:
Bonny grows only pink parrots and green parrots. He grows three times as many green parrots as pink parrots. He feeds his parrots either soy beans or wheat, but no single parrot feeds on both kinds of food. Half of the parrots that feed on soy beans are green, and among the pink parrots, those that feed on soy beans are twice as many as those that feed on wheat. If 40 of Bonny’s parrots feed on wheat, how many of the wheat feeding parrots are green?

A. 15
B. 30
C. 35
D. 45

HI
Please help me to solve this question am stuck..


It seems that this question is not from GMAT sources as it has only 4 answer choices instead of 5. Anyway, the easiest way to solve it would be to fill a double set matrix step by step:
Attachment:
Parrots.PNG
Notice, that we have two equations: y+y/2=x and x+3x=2y+40 --> solve for x and y --> x=15 and y=10 --> ?=35.

Check solved matrix:
Attachment:
Parrots - Solution.PNG
Answer: C.

Hope it's clear.


Hi
When Used pink=30 and green= 90...I got 30 as an answer. Please correct me where I am making mistake

soya wheat
Pink 30 20 10
Green 90 60 30
Total 120 80 40

Please advice
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Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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New post Updated on: 09 Jul 2014, 21:44
GGMAT760 wrote:
Bunuel wrote:
happycreck1 wrote:
Bonny grows only pink parrots and green parrots. He grows three times as many green parrots as pink parrots. He feeds his parrots either soy beans or wheat, but no single parrot feeds on both kinds of food. Half of the parrots that feed on soy beans are green, and among the pink parrots, those that feed on soy beans are twice as many as those that feed on wheat. If 40 of Bonny’s parrots feed on wheat, how many of the wheat feeding parrots are green?

A. 15
B. 30
C. 35
D. 45

HI
Please help me to solve this question am stuck..


It seems that this question is not from GMAT sources as it has only 4 answer choices instead of 5. Anyway, the easiest way to solve it would be to fill a double set matrix step by step:
Attachment:
Parrots.PNG
Notice, that we have two equations: y+y/2=x and x+3x=2y+40 --> solve for x and y --> x=15 and y=10 --> ?=35.

Check solved matrix:
Attachment:
Parrots - Solution.PNG
Answer: C.

Hope it's clear.


Hi
When Used pink=30 and green= 90...I got 30 as an answer. Please correct me where I am making mistake

soya wheat
Pink 30 20 10
Green 90 60 30
Total 120 80 40

Please advice



Pre-assumed values will lead to an incorrect answer.

Actual Pink = 15; Green = 45 Total = 60

Green Wheat = 20+15 = 35
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Originally posted by PareshGmat on 09 Jul 2014, 21:30.
Last edited by PareshGmat on 09 Jul 2014, 21:44, edited 1 time in total.
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Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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New post 09 Jul 2014, 21:42
Solved using single variable "x"

Refer diagram for details. We require to find the value of the green shaded block

Total Pink = x

Total Green = 3x

Total Parrots = x + 3x = 4x

Total Parrots = Total Green + Total Pink = Total Wheat + Total Soy = 4x

Parrots on wheat = 40

So, Parrots on Soy = 4x - 40

1/2 of Parrots on Soy are green

So, Green Parrots = 2x-20; so pink would be same = 2x - 20

Among the pink parrots, those that feed on soy beans are twice as many as those that feed on wheat

2(20-x) = 2x-20

x = 15

(20+x) = Green Parrots on Wheat = 20+15 = 35

Answer = C
Attachments

ch.png
ch.png [ 6.68 KiB | Viewed 2705 times ]


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Re: Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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New post 02 Aug 2014, 05:56
1
It's from Economist GMAT
Answer choices are

A. 5
B. 15
C. 30
D. 35
E. 45

35 is Answer, which is D in the original answer choice
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Re: Bonny grows only pink parrots and green parrots. He grows  [#permalink]

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