To find the probability of drawing certain colour of balls, we first need to find the total number of balls:5 + 7 +5 = 17For the number of red balls that need to be addedThe original probability of drawing a red ball: red ball/ total number of balls= 5/17To find the number of balls required, we can set an equation.Let the number of red balls that need to be added be x.5+x / 17+x = 5/6(5+x) x 6 = (17+ x) x530 + 6x = 85 + 5x6x - 5x = 85 - 30x = 55Therefore, 55 red balls need to be added.For the number of black balls that need to be addedThe original probability of drawing a white ball: white ball/ total number of balls=5/17To find the probability required, we can set an equation.Let the number of black balls that need to be added be y.5/ 17 + y = 1/65 x 6 = 17 + y 30 = 17 + y30 - 17 = yy = 13Therefore, 13 black balls need to be added.Hope it helps!