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Question
A bag contains 24 red and white balls. If the probability of drawing a red ball is twice that of drawing a white, how many white balls are there?
A bag contains 24 red and white balls. If the probability of drawing a red ball is twice that of drawing a white, how many white balls are there?
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Solution
Assume, No. of white balls = x, No. of red balls = 24 - x
The probability of drawing red ball is twice that of drawing a white ball.
From question,
24−x24 = 2 × x24
24 - x = 2x
3x = 24
x = 8
Hence, No. of white balls = 8
Assume, No. of white balls = x, No. of red balls = 24 - x
The probability of drawing red ball is twice that of drawing a white ball.
From question,
24−x24 = 2 × x24
24 - x = 2x
3x = 24
x = 8
Hence, No. of white balls = 8
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