New SIDBI Grade A New Batch Starts on Nov 18

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    Question

    A class has 28 students, including 8 girls and the …… boys. If …… girls leave the class, the probability of randomly selecting a boy becomes 5/6.

    Which of the following satisfies the two blanks given in the question?

    I)  20, 4

    II)  20, 3

    III)  20, 2

    A Only I Correct Answer Incorrect Answer
    B Only II Correct Answer Incorrect Answer
    C Only III Correct Answer Incorrect Answer
    D Both I and II Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the number of girls left be x, Total students = 28 The number of girls = 8 Then, the number of boys = 20 20 /(28 – x) = 5/6 28 – x = 24 x = 4

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