Question

a bag contains 5 red balls and some Blue Balls if the probability of drawing a blue ball is double that of a red ball determine the number of blue balls in the bag ​

Answer 1

Answer:

number of red balls=5

let the number of blue balls=x

Total number of outcomes= 5+x

It is given that, probability of blue ball is double that of red ball.

i.e, P(blue ball)=2 P(red ball)

P(red ball)= 5/5+x

p(blue ball)=x/x+5

Now, p(blue ball)=2p(red ball)

x/5+x = 2(5/5+x)

by cross multiplication,

5+x= 50

x=50-5=45

Hence, X=45