Question

    What approximate value should come in place of question mark (?) in the following questions? (You are not expected to calculate the exact value.)

    20.57 ×28.04 ÷ ? + 254 = 429.06

    A 3 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 1 Correct Answer Incorrect Answer
    D 7 Correct Answer Incorrect Answer
    E 9 Correct Answer Incorrect Answer

    Solution

    20.57 ×28.04 ÷ ? + 254 = 429.06 21 ×28 ÷ ? + 254 = 429 21 ×28 ÷ ? = 175 588/(? )= 175 ? = 3.818 ≈ 3

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