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    Question

    840 400 180 ? 15

    -12.5 What should come in place of the question mark (?) in the following number series:
    A 12 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 70 Correct Answer Incorrect Answer
    D 80 Correct Answer Incorrect Answer
    E 90 Correct Answer Incorrect Answer

    Solution

    840 ÷ 2 - 20 = 400 400 ÷ 2 - 20 = 180 180 ÷ 2 - 20 = 70 70 ÷ 2 - 20 = 15 15 ÷ 2 - 20 = -12.5

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