A bag contains a number of marbles of which 35 are blue, 10 are red and the rest are

yellow. If the probability of selecting a yellow marble from the bag at random is, how

many yellow marbles are in the bag?

Y = 45*p (y) / (1 - p (y)) if I knew what p (y) is, we can find how many yellow marbles there are. p (y) = probability of choosing yellow.

Step-by-step explanation:

Total marbles = 35 + 10 + yellow

If probability of choosing yellow = p (y) = yellow/Total

p (y) = Y / (35 + 10 + Y)

Solve for Y,

p (y) * (35 + 10 + Y) = Y

45*p (y) + p (y) * Y = Y

45*p (y) = Y - p (y) * Y

Y = 45*p (y) / (1 - p (y))