Question

35. There are 30 blue balls and x red balls in a
bag. A ball is drawn at random from the bag.
(i) Write down, in terms of x, an expression
for the probability that the ball drawn is
red.

(ii) Given that the probability is
7/13, find x.
(with solution)​

Answer 1

Answer:

(1) = x / (30+x)

(2)= 35

so the blue ball nom is 35