Question

 bag contains 5 red balls and some blue balls if the probability of drawing blue ball is double that of red ball then find the number of blue balls in the bag​

Answer 1

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 /x

Probability of drawing a Red ball =  

Total no of ball

No. of red ball

​P(R)=  5+x /5

​Given,

P(B)=2P(R)

x  /5+x =2(  5)/5+x

x=10

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

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