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# A bowl contains both red and green marbles. How many green

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Director
Joined: 25 Oct 2006
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A bowl contains both red and green marbles. How many green [#permalink]  02 Jun 2007, 21:38
1. A bowl contains both red and green marbles. How many green marbles are in the bowl?

1) If a marble is randomly selected from the bowl, the probability that a green marble will be selected is 1/3.
2) If one green marble is removed from the bowl and then a marble is selected at random from those remaining in the bowl, the probability that a green marble will be selected is 1/5.
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2. There is a linear relationship between variable r and variable s. When r has a value of 6, s has a value of 30. When r has a value of 24, s has a value of 60. What is the value of r that corresponds to a value of s of 100?
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3. If n is a positive integers, what is the largest value of n such that 2n is a factor of 20!?

I have solved the first one and got the answer Green balls = 2 and Red =4

Is their any rule to solve the second problem? How to build the equation for that?

Director
Joined: 26 Feb 2006
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Re: Arithmatic problems [#permalink]  03 Jun 2007, 00:43
priyankur_saha@ml.com wrote:
2. There is a linear relationship between variable r and variable s. When r has a value of 6, s has a value of 30. When r has a value of 24, s has a value of 60. What is the value of r that corresponds to a value of s of 100?

r: 6, 24 (6+3x6) = change 18
s: 30, 60 (30 + 3x10) = change 30

if s = 30 + (7x10) = 100, r = 6 + (7x6) = 48
Manager
Joined: 14 Mar 2007
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A. C. No of marbles are 2

S1. This means there are x green marbles and a total of 3x marbles
INSUFF
S2. Alone INSUFF

S1andS2. Gives us the equation (x-1)/(3x-1) = 1/5
Solve to get x=2
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