A bag contains 5

Let the number of blue balls be X

So total number of balls = 5+X

P(probability of drawing a red ball from the bag) =

P(probability of drawing a blue ball from the bag)=

ATQ ,

=

=

5X +X² = 75+15X

X² - 10X+ -75 = 0

(x-15)(x+5) =0

So X -5

Therefore No. Of blue balls = 15