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A bag contains 5 red and some black balls. If the probability of drawing a black ball is thrice that of a red ball, the number of black balls in the bag is: 
  • a)
    5
  • b)
    10
  • c)
    15
  • d)
    20
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A bag contains 5 red and some black balls. If the probability of drawi...
Let the number of black balls in the bag be x. 
∴ 
⇒ x = 15
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A bag contains 5 red and some black balls. If the probability of drawing a black ball is thrice that of a red ball, the number of black balls in the bag is:a)5b)10c)15d)20Correct answer is option 'C'. Can you explain this answer?
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