Question

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Answer 1

Step-by-step explanation:

Total number of balls = 15.

Number of blue balls = x.

Then, the number of red balls = 15 - x.

Given that number of red balls are increased by 5 => 20 - x.

Given that Probability of red ball doubles.

⇒ (20 - x)/20 = 2(15 - x)/15

⇒ 15(20 - x) = 40(15 - x)

⇒ 300 - 15x = 600 - 40x

⇒ -300 = 25x

⇒ x = 12.

Then, number of blue balls = 12 and red balls = 15 - 12 = 3.

(i) Probability of taking red ball:

P(getting red ball) = 3/15 = 1/5

(ii) Probability of getting blue ball:

P(blue ball) = 12/15 = 4/5

(iii) Probability of blue balls 5 extra red balls are added):

P(blue ball with 5 extra red ball) = 12/20

                                                     = 3/5

Hope this helps!

Answer 2

Answer:

Step-by-step explanation:

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What is your question?

No spam plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz​

Answers

:

Total number of balls = 15.

Number of blue balls = x.

Then, the number of red balls = 15 - x.

Given that number of red balls are increased by 5 => 20 - x.

Given that Probability of red ball doubles.

⇒ (20 - x)/20 = 2(15 - x)/15

⇒ 15(20 - x) = 40(15 - x)

⇒ 300 - 15x = 600 - 40x

⇒ -300 = 25x

⇒ x = 12.

Then, number of blue balls = 12 and red balls = 15 - 12 = 3.

(i) Probability of taking red ball:

P(getting red ball) = 3/15 = 1/5

(ii) Probability of getting blue ball:

P(blue ball) = 12/15 = 4/5

(iii) Probability of blue balls 5 extra red balls are added):

P(blue ball with 5 extra red ball) = 12/20

= 3/5