Question

4. A bag contains 5 red balls and some blue balls. If the probability of drawing the blue ball is double that of a
red ball, find the number of blue balls in the bag.
​

Answer 1

Step-by-step explanation:

5 r

x b

p(r) = 5/5+x

p(b) = x/5+x

p(b) = 2p(r)

x/5+x = 2×5/5+x

x= 10

no of balls = 10 blue , 5 red = 15 balls

p(r) = 5/15 = 1/3

p(b) = 10/15 =2/3