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12 April, 11:16

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?

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  1. 12 April, 14:03
    0
    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))
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