📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

    Question

    A box has ‘x’ black marbles, ‘x + 5’ blue

    marbles and ‘x – 1’ yellow marbles. If the probability of selecting a yellow marble is 1/28 less than the probability of selecting a blue marble, find ‘x’.
    A 54 Correct Answer Incorrect Answer
    B 34 Correct Answer Incorrect Answer
    C 90 Correct Answer Incorrect Answer
    D 66 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    According to question: (x + 5)/(3x + 4) – (x – 1)/(3x + 4) = 1/28 (x + 5 – x + 1)/(3x + 4) = 1/28 6/(3x + 4) = 1/28 3x + 4 = 168 3x = 164 x = 54

    Practice Next
    More Probability Questions

    Relevant for Exams:

    ask-question