Multiple Choice Questions on There are lsquo x rsquo bottles and lsquo y rsquo glasses in a tray and the probability of randomly ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

There are lsquo x rsquo bottles and lsquo y rsquo glasses in a tray and the probability of randomly ...........

Quantitative Aptitude ( CCS) Probability
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    There are ‘x’ bottles and ‘y ’ glasses in a tray and the probability of randomly picking a bottle is 2/5. Four bottles are added to the tray and the probability of picking a bottle becomes is 4/7. What was the number of glasses in th tray?

    5

    Incorrect Answer

    6

    Correct Answer

    7

    Incorrect Answer

    8

    Incorrect Answer
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    Explanation:

    x/(x+y) = 2/5
    => 3x = 2y —-(1)
    (x+4)/(x+y+4) = 4/7
    => 3x+12 = 4y —-(2)
    On solving these two equations, we get
    x = 4 and y = 6

    Hence, option 2 is the correct answer.

    By: Amit Kumar
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