Answers

2016-01-29T22:23:38+05:30
No of red balls=5
let the no of blue balls be =x
total balls =5+x
Probability of getting blue ball=x/5+x
probability of getting red ball=5/5+x
acc to the question:
x/5+x=2*5/5+x
solving this we get x=10
hence no of blue balls =10
2 5 2