Question

a bag contains some blue balls and 6 red ball a ball is drawn at random if the probability of drawing a blue ball is double the probability of drawing a red ball then find the number of blue balls in the bag​

Answer 1

Answer:

As it is given red balls are 6

and Blue balls are double the red balls

Probability=Number

Step-by-step explanation:

So double of 6= 12

Answer 2

Answer:

12

Step-by-step explanation:

Let the number of blue balls be x.

Total balls = blue + red

= x + 6

Probability of an event = no. of favorable outcomes/ total no. of outcomes

here, favorable outcomes = no. of balls of each color.

total outcomes = total no. of balls

P(blue) = x/ (x + 6)

P(red) = 6/ (x + 6)

We're given that,

P(blue)= 2 × P( red)

x/ (x + 6) = 2 × 6/ (x + 6)

multiplying both sides by (x + 6)

{x/ (x + 6) } × (x + 6) = { 12/ (x + 6) } × (x + 6)

x = 12

and since x is the number of blue balls

the number of blue balls is 12.

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Hope this helps!