Question

32. A bag has 24 balls. Some are white and
remaining black. If the probability of drawing
a white ball is twice that of drawing a black
ball, find the number of white balls.(with Solution)​

Answer 1

number of white balls = 16

number of black balls = 8

let the no. of black balls be x

white balls=2*x

=2x

therefore,

2x+x=24

3x=24

x=24/3

x=8

white balls =2x

=2*8

=16

Answer 2

Answer:

Number of white balls =15

Let number of black balls =x

Total number of outcomes =15+x

P

1

= Probability of getting white ball =

15+x

15

P

2

= Probability of getting black ball =

15+x

x

As per question

P

2

=3P

1

⇒

15+x

x

=3×

15+x

15

⇒

15+x

x

=

15+x

45

∴x=45

Hence number of black balls is 45.

See answer in attachment.... hope it helps u...