New SIDBI Grade A New Batch Starts on Nov 18

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    Question

    48 pens are there in a box where 22 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 3:5 Correct Answer Incorrect Answer
    C 6:7 Correct Answer Incorrect Answer
    D 5:1 Correct Answer Incorrect Answer

    Solution

    Probability of getting a blue  pen , => p/48 = 1/4 => p = 12 So, number of black  pens  = 48 – 22 – 12 = 14 Required ratio = 12 : 14 = 6:7

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