Question

A bag contain 5 red balls & some blue ball. If the probability of drawing a blue ball from a bag is thrice that of drawing a red ball. Find the number of blue balls in the bag?​

Answer 1

Answer:

I think 8blue balls in this bag

Answer 2

Answer:

Let the number of blue balls be y

Total number of balls= 5+y

Probability of getting blue ball= 3 × probability of red ball

y/5+y = 3×5/ 5+y

Therefore, the number of blue balls is 15