Question

A box contains 5 red balls & some blue balls .if probability of drawing blue ball is double that of red ball find number of balls in bag

Answer 1

Answer:

10

Step-by-step explanation:

let the no of blue balls = x

then probability of drawing a red ball= 5/(5+x)

probability if drawing a blue ball =2( 5/(5+x))

sum of both probabilities = 1

so,

5/(5+x) +2( 5/(5+x)) = 1

15 / (5+x) = 1

15 = 5+x

x=10