17. Five mark example problem IV

A bag contains \(6\) green balls, some black and red balls. Number of black balls is as twice as the number of red balls. Probability of getting a green ball is thrice the probability of getting a red ball. Find (i) number of black balls (ii) total number of balls.

 

Answer:

 

The number of black balls \(=\)

 

The total number of balls \(=\)