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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 35 Correct Answer Incorrect Answer
      B 30 Correct Answer Incorrect Answer
      C 32 Correct Answer Incorrect Answer
      D 37 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      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 = 1.4 × 25 = 35
      Hence, the number of black balls in the bag = 35

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