A box contains some black balls and 25 white balls.If the probability of drawing a black ball is third fifths of white ball. Find the number of black ball

Answers (1)

Number of white balls=25

Number of black balls=B

Probability of drawing a black ball is third fifths of white balls.

P(B) = 3xP(W)/5 

B/(25+B)=3x25/(25+B)5

Number of black balls (B)=15

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