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    Question

    A bag contains 25 white and some black balls. If the

    probability of drawing a black ball from the bag is 1.4 times that of drawing a white ball, find the number of black balls in the bag.
    A 30 Correct Answer Incorrect Answer
    B 32 Correct Answer Incorrect Answer
    C 35 Correct Answer Incorrect Answer
    D 31 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Given, Number of white balls = 25 Let x be the number of black balls. Total number of balls in the bag = 25 + x Also, the probability of drawing a black ball from the bag is 1.4 times that of drawing a white ball. ⇒ x/(25 + x) = 1.4[25/(25 + x)] ⇒ x = 35 Hence, the number of black balls in the bag = 35.

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