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Question
Ritwik draws a ball from a bag that contains white and yellow balls. The probability of choosing a white ball is `2/9`. If the total number of balls in the bag is 36, find the number of yellow balls.
Solution
The probability of choosing a white ball = `2/9`
Then, the probability of choosing a yellow ball = `1 - 2/9`
= `(9 - 2)/9`
= `7/9`
Given, total number of balls in the bag = 36
∴ Number of yellow balls = `7/9 xx 36` = 28
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