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What is the probability of getting Green balls?

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by vidhya16 » Sat Sep 01, 2012 8:59 am
Bag contains red, white and green balls.

Probability of getting white balls is 1/4. 5 red balls are added to the bag and no other balls are added.
How many green balls are in the bag?
A) W= 7& R = 14
b) G+R = 8.
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Source: — Data Sufficiency |
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by vk_vinayak » Sat Sep 01, 2012 9:49 am
vidhya16 wrote:Bag contains red, white and green balls.

Probability of getting white balls is 1/4. 5 red balls are added to the bag and no other balls are added.
How many green balls are in the bag?
A) W= 7& R = 14
b) G+R = 8.
G?

A. W=7 and Probability of getting white balls is 1/4. It means there were total 28 balls. w=7 and R=(14-5)=9. Therefor there were 12 green balls. Since number of green balls didn't change, now also there are 12 green balls. SUF

B. G+R=8. Before adding 5 red balls, Red balls could be 1 or 2. And also we don't know about white balls. INSUF.

Ans A.
- VK

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