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A bag contains 5 red balls and some blue...

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.

A

`10`

B

`5`

C

`15`

D

`20`

Text Solution

Verified by Experts

The correct Answer is:
A
Let number of blue balls is `x`.
Number of red balls `=5`
So, total number of balls `=5+x`
We are given,
Probability of drawing a blue ball is double that of a red ball.
So,`x/(5+x) = 2**(5/(5+x))`
`=>x=10`
So, number of blue balls are `10`.
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