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    Question

    32 pens are there in a box where 14 are red pens,

    ‘p’ are blue pens and remaining are black pens. If a pen is picked, the probability of getting blue pen is 0.25. Find the ratio of the number of blue pens and black pens.
    A 5:2 Correct Answer Incorrect Answer
    B 4:5 Correct Answer Incorrect Answer
    C 6:7 Correct Answer Incorrect Answer
    D 7:1 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Probability of getting a blue  pen , => p/32 = 1/4 => p = 8 So, number of black  pens  = 32 – 14 – 8 = 10 Required ratio = 8 : 10 = 4:5

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