Question
A bag contains 7 blue balls, 3 red balls and remaining
were black balls. Probability of drawing a black ball from the bag is (4/9) . Find the number of black balls in the bagSolution
ATQ, Let the number of black balls be 'y'. ATQ, y ÷ (y + 7 + 3) = (4/9) Or, 9y = 4 X (y + 10) Or, 9y = 4y + 40 Or, 5y = 40 So, 'y' = 8
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