Answer :
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
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