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# A child has a bag of 60 marbles with 6 different colors 15 green, his

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Math Expert
Joined: 02 Sep 2009
Posts: 52390
A child has a bag of 60 marbles with 6 different colors 15 green, his  [#permalink]

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19 Jan 2017, 06:57
00:00

Difficulty:

25% (medium)

Question Stats:

82% (01:25) correct 18% (01:29) wrong based on 91 sessions

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A child has a bag of 60 marbles with 6 different colors 15 green, his favorite color, 10 red, 10 black, 7 blue, 6 orange, 5 purple, 4 white, and 3 yellow. For his birthday, he receives 40 marbles. How many of those marbles must be his favorite color to increase the percentage to 30 percent?

A. 5
B. 10
C. 12
D. 15
E. 30

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Joined: 16 May 2009
Posts: 1
Re: A child has a bag of 60 marbles with 6 different colors 15 green, his  [#permalink]

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19 Jan 2017, 16:59
Total new number of marbles = 60+40 = 100.
x-number of favorite color (green) added
new number of green = 30%*100 = 0.3*100=30
x=30-15=15

Answer D.
Director
Joined: 14 Nov 2014
Posts: 632
Location: India
GMAT 1: 700 Q50 V34
GPA: 3.76
Re: A child has a bag of 60 marbles with 6 different colors 15 green, his  [#permalink]

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19 Jan 2017, 19:45
Bunuel wrote:
A child has a bag of 60 marbles with 6 different colors 15 green, his favorite color, 10 red, 10 black, 7 blue, 6 orange, 5 purple, 4 white, and 3 yellow. For his birthday, he receives 40 marbles. How many of those marbles must be his favorite color to increase the percentage to 30 percent?

A. 5
B. 10
C. 12
D. 15
E. 30

Going with D.
I was confused fav is red or green.
But we dont have any answer choice for red.
So green is fav and answer is 15 .
Manager
Joined: 04 Dec 2016
Posts: 54
Location: India
GPA: 3.8
WE: Operations (Other)
A child has a bag of 60 marbles with 6 different colors 15 green, his  [#permalink]

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19 Jan 2017, 20:05
D.

Total (initially) = 60
Total Green (initially) = 15

Total (Finally after receiving 40 more) = 100
Totalt Green required = 30% of 100 = 30

But, the child already have 15 Green so he need 15 more.

Therefore, 15 must be green out of 40.
Manager
Joined: 03 Jan 2017
Posts: 150
Re: A child has a bag of 60 marbles with 6 different colors 15 green, his  [#permalink]

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12 Mar 2017, 07:54
15/60=25%
?/100=30% ?=30

30-15=15
Hence answer is D
Re: A child has a bag of 60 marbles with 6 different colors 15 green, his &nbs [#permalink] 12 Mar 2017, 07:54
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# A child has a bag of 60 marbles with 6 different colors 15 green, his

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