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    Question

    66.05 × 17.95 – 38.99 × 18.12 = (60 + ?) ×

    6  What is the approximate value that should come in place of question mark (?) in the following questions? (You are not needed to calculate the exact value)
    A 30 Correct Answer Incorrect Answer
    B 40 Correct Answer Incorrect Answer
    C 20 Correct Answer Incorrect Answer
    D 25 Correct Answer Incorrect Answer
    E 35 Correct Answer Incorrect Answer

    Solution

    66.05 × 17.95 – 38.99 × 18.12 = (60 + ?) × 6 66 × 18 – 39 × 18 = (60+?) × 6 18 (66 -39) =   (60+?) × 6 18 × 27 =   (60+?) × 6 81 =  60 + ? ? = 81 - 60 = 21 = Approx 20

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