Question

One bag contains 40 balls .Some of them are blue, red and the rest are black

The probability of drawing red balls is 11/20

Blue is 1/5

(1) Find the number of blue balls

(2) What is the probability of getting a blue ball?​

Answer 1

Answer:

1) 454

2)6796%

Hope it will help you

Answer 2

Let no. of red balls = x, no. of blue balls =y and no.of black balls = z.

Probability of drawing a red ball = P (red ball) =

20

11

=

40

x

⇒ x=22

Probability of drawing a blue ball = P (Blue ball) =

5

1

=

40

y

⇒ y=8

∴ No of black balls = 40- 22 -8 =10

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