Question

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.

Answer 1

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`.