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Thread: Probability Question related to GMAT

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    Probability Question related to GMAT




    There are a total of 60 white and red balls in the box. A ball in picked randomly. If the probability of picking a white ball is 2/5. How many red balls should be taken out so that the probability of picking white balls becomes 7/9 ?

    I am unable to crack this one.

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    Re: Probability Question related to GMAT


    2/5 * 60 = 24

    There are 24 white and 36 red.

    Since 24/X = 7/9

    does not have an integer solution, you cannot solve this by just removing red balls.

    If you remove red and white balls you can have 7/9, 14/18 or 21/27.

    (7 white and 2 red) or (14 white and 4 red) or (21 white and 6 red)

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