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    Question

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    A 30 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 25 Correct Answer Incorrect Answer
    D 20 Correct Answer Incorrect Answer

    Solution

    ⇒ A = (1 + 4/5)B = 9B/5 ⇒ C = (100% - 48 4/7%)(A + B) = 51 3/7% (9B/5 + B) ⇒ C = (3.6/7) × (14B/5) = 7.2B/5 Difference between A and C = 1.8B/5 ⇒ Percentage = (1.8B/5)/(9B/5) × 100 = 0.2 × 100 = 20% ∴ The required percentage = 20%

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