A bag contains 7 white and some red balls. If the probability of drawing a red ball is doubles that of white ball, find the no. of red balls in the bag.
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A bag contains 5 white balls and some red balls. If the probability of drawing a red ball is double that of a white ball, find the number of red balls in the bag
try this in the same method
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p(r)=x/7+x
x/7+x=14/7+x..........given
x^2+7x=98+14
x^2-7x-98=0
x=-7,14
probability cannot be in negative. so ,x=14
x/7+x=14/7+x..........given
x^2+7x=98+14
x^2-7x-98=0
x=-7,14
probability cannot be in negative. so ,x=14
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