SOLUTION: A bag contains 5 red balls and n green balls. If the probabilit y of drawing a green ball is three times that of a red ball then what is the value of n?

Question 507789: A bag contains 5 red balls and n green balls. If the probabilit y of drawing a green ball
is three times that of a red ball then what is the value of n?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A bag contains 5 red balls and n green balls. If the probability of drawing a green ball is three times that of a red ball then what is the value of n?
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P(red) = 5/(n+5)
P(green) = (n-5)/(n+5)
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Equation:
(n-5)/(n+5) = 3[5/(n+5)]
----
Rearrange:
[(n-5-15]/(n+5) = 0
----
Simplify
n-20 = 0
n = 20
============
Cheers,
Stan H.
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