a bag contains 15 red balls 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 total number of balls in the bag
Answers
Answer:
No of red balls=15
No of black balls=x
Total no of outcomes=15+x
Probability of red balls=15/15+x. (P1)
Probability of black balls=x/15+x. (P2)
According to the question,
(P2)=3(P1)
x/15+x=3×15/15+x
By solving this equation we get,
x=45
Step-by-step explanation:
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x = 45
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