Question

    (4.88 × 5.76)2 - ?2 = 39.89 ×

    19.86 What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
    A 25 Correct Answer Incorrect Answer
    B 67 Correct Answer Incorrect Answer
    C 35 Correct Answer Incorrect Answer
    D 10 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, (4.88 × 5.76)2 - ?2 = 39.89 × 19.86 (5 × 6)2 – 40 × 20 ~ ?2 900 – 800 ~ ?2 ? ~ 10

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