Abag contains 40 balls, some of which are red, some of which are yellow and the rest are black. the
respectively
probabilities of drawing a red ball and a yellow ball at random from the bag are
(i) fond the probability of drawing a black ball at random from the bag.
(2x + 1) red balls and (x + 2) yellow balls are added to the bag while (x - 3) black balls are removed from the bag. the probability of drawing a yellow ball at random from the bag is now 3/7.find
(ii) an expression, in terms of x, for the total number of balls in the bag now,
(iii) the number of yellow balls in the bag now.