Question

a bag contains 5 red balls and some Blue Balls if the probability of blue ball is double the red ball then find number of blue balls​

Answer 1

Answer:

x=10

Step-by-step explanation:

Let number of blue balls in the bag =x

Total no of balls in bag =5+x  [No. of redball =5]

Probability of drawing a blue ball =  

Total no of ball

No. of blue ball

P(B)=  5+x

Probability of drawing a Red ball =  

Total no of ball

No. of red ball=P(R)=5+x5

Given,

P(B)=2P(R)

5+x

x

=2(5+x5)

x=10

Hence, no. of blue balls in the bag =10.

Answer 2

Answer:

10

Step-by-step explanation:

You have 5 red balls. Your probability is 'x'. The probability of blue balls is twice of that of the red balls. Hence there are twice the number of red balls,

i.e., 5 x 2 = 10.