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    Question

    24 pens are there in a box where 10 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 3:4 Correct Answer Incorrect Answer
    C 17:7 Correct Answer Incorrect Answer
    D 7:1 Correct Answer Incorrect Answer

    Solution

    Probability of getting a blue  pen , => p/24 = 1/4 => p = 6 So, number of black  pens  = 24 – 10 – 6 = 8 Required ratio = 6 : 8 = 3:4 

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