Question

A bag contains 5 white balls and some blue balls. If probability of drawing a blue ball is double that of white ball, determine tha number of blie balls in tha bag​

Answer 1

Let the number of blue balls be x.

Number of red balls = 5

Total number of balls = x + 5

P (getting a red ball)=5/x+5

P (getting a blue ball)=x/x+5

Given that

But number of balls cannot be negative.

Hence, the number of blue balls is 10.