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# How many of the 60 balls in the basket are green?

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Math Expert
Joined: 02 Sep 2009
Posts: 52385
How many of the 60 balls in the basket are green?  [#permalink]

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11 Nov 2016, 00:27
00:00

Difficulty:

35% (medium)

Question Stats:

59% (00:50) correct 41% (00:47) wrong based on 166 sessions

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How many of the 60 balls in the basket are green?

(1) The probability of randomly picking a green ball out of the basket is 1/12

(2) Of the 12 balls that were taken out of the basket, 1 was green.

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Joined: 06 Jun 2016
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Location: India
Concentration: Operations, Strategy
Schools: ISB '18 (D)
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How many of the 60 balls in the basket are green?  [#permalink]

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Updated on: 11 Nov 2016, 08:44
Bunuel wrote:
How many of the 60 balls in the basket are green?

(1) The probability of randomly picking a green ball out of the basket is 1/12

(2) Of the 12 balls that were taken out of the basket, 1 was green.

IMO A

from statement 1
P(green ball)= 1/12
hence out of 60 balls 5 balls are green.
Sufficient

from statement 2
Of the 12 balls that were taken out of the basket, 1 was green
insufficient as of the next 12 balls taken out there can be 0 or any number of green balls

hence A

Originally posted by Vinayak Shenoy on 11 Nov 2016, 01:55.
Last edited by Vinayak Shenoy on 11 Nov 2016, 08:44, edited 1 time in total.
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Re: How many of the 60 balls in the basket are green?  [#permalink]

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11 Nov 2016, 08:27
I don't think the answer is D.

Statement 2 does not say, 1 in 12 is green. It says out of twelve balls taken out, one was green. The 12 may not be an accurate sample set. Additionally, maybe the next set of 12 balls taken out contains 4 green balls.

Banuel, am I right?
Senior Manager
Joined: 06 Jun 2016
Posts: 258
Location: India
Concentration: Operations, Strategy
Schools: ISB '18 (D)
GMAT 1: 600 Q49 V23
GMAT 2: 680 Q49 V34
GPA: 3.9
Re: How many of the 60 balls in the basket are green?  [#permalink]

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11 Nov 2016, 08:45
1
vp101 wrote:
I don't think the answer is D.

Statement 2 does not say, 1 in 12 is green. It says out of twelve balls taken out, one was green. The 12 may not be an accurate sample set. Additionally, maybe the next set of 12 balls taken out contains 4 green balls.

Banuel, am I right?

Thanks for the correction. You are right. It does not say 1 in 12 is green
corrected my solution.
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Re: How many of the 60 balls in the basket are green?  [#permalink]

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12 Nov 2016, 04:14
Statement 1 : 1/12 -> multiply by 5 -> 5/60 -> probabaility of getting a green ball .. Suff
Statement 2 : give information about 12 of the 60 balls.. Not suff

Ans A
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Re: How many of the 60 balls in the basket are green?  [#permalink]

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22 Apr 2018, 18:26
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Re: How many of the 60 balls in the basket are green? &nbs [#permalink] 22 Apr 2018, 18:26
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