Q1. A box contains x red marbles, (x+3) yellow marbles and (4x-15) blue marbles. a) Find an expression in terms of x, for the total number of marbles in the box. b) A marble is drawn at random from the box. Write an expression in terms of x to find the probability of drawing a blue marble. c) If the probability in (part 2) is ½, find the value of x.
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a.) total marbles = x+3 +4x-15 +x
= 6x-12
b.) p(of blue ball) = 4x-15/6x-12
c.) p(of blue ball) = 4x-15/6x-12 = 1/2
x= 9
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