Question

a bag contains 15 white and some black balls,if prob of drawing black = 3(drawing white ),find no of black balls

Answer 1

Let probablity of drawing white ball be 'x'
then probablity of drawing black = 3x
x + 3x = 1
4x = 1
x = 1/4
Probablity of drawing white ball = 1/4
1/4 = 15/Total balls
Total balls = 15 x 4 = 60
Black balls = Total Balls - White balls
= 60 - 15
= 45
The bag contains 45 black balls.
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