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A bag contains 15 white and some black...

A bag contains 15 white and some black balls. If the probability of drawing a black ball from the bag is thrice that of drawing a white ball find the number of black balls in the bag.

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The correct Answer is:
45
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Knowledge Check

  • A bag contains 15 white balls and some black balls. If the probability of drawing a black ball is thrice that of a white ball, find the number of black balls in the bag.

    A
    `40`
    B
    `45`
    C
    `15`
    D
    `60`
  • A box contains some black balls and 30 white balls. If the probability of drawing a black ball is two fifths of a white ball, then the number of black balls in the box is

    A
    6
    B
    12
    C
    18
    D
    30
  • There are 5 red and 4 black balls in a bag. The probability of drawing a red ball is:

    A
    `4/9`
    B
    `5/9`
    C
    `5/11`
    D
    `6/11`
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