Question

11(b). A bag contains 8 red balls and some white balls, all of the same size. If the probability of drawing at random a white ball from the bag is half the probability of drawing a red ball, find the number of white balls in the bag.

Accepted Answer

Let white balls = n; total = n + 8
P(white) = n/(n+8)
P(red) = 8/(n+8)
n/(n+8) = ½ × 8/(n+8)
n = 4
Number of white balls = 4

WAEC Mathematics 2025 Theory — Question 14

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