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    Question

    30 pens are there in a box where 9 are red pens, ‘p’

    are blue pens and remaining are black pens. If a pen is picked, the probability of getting blue pen is 0.5. Find the ratio of the number of blue pens and black pens.
    A 5:2 Correct Answer Incorrect Answer
    B 3:5 Correct Answer Incorrect Answer
    C 6:7 Correct Answer Incorrect Answer
    D 2:1 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Probability of getting a blue  pen , => p/30 = 1/2 => p = 15 So, number of black  pens  = 30 – 15 – 9 = 6 Required ratio = 15 : 6 = 5:2

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