Question

A bag contains 8 white and some black balls.If the probability of drawing a black ball from the bag is four times that of awhite ball, find the number of black balls in the bag.

Answer 1

let the no black ball be x
and given no of white balls = 8 =y
now according to question given that

x/y =4/1 then x/8 =4/1


so x = 4×8 =32

Answer 2

Hope its help u......