Question

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

Answer 1

Answer:

45

Step-by-step explanation:

Let b be the number of black balls.

Then...

P(black) = 3 × P(white)

=> # black balls = 3 × (# white balls)

=> b = 3 × 15

=> b = 45