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Question

A box contains some black balls and 30 white balls. If the probability of drawing a black ball is two-fifths of a white ball, find the number of black balls in the box.
[3 MARKS]


Solution

Steps: 2 Marks
Answer: 1 Mark

Let the number of black balls be x
Then total balls =x+30
P (black balls) =xx+30
P(white balls) =30x+30
But xx+30=25×30x+30
5x=60x=12
Number of black balls =12.

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