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    Question

    What should come in place of the question mark (?) in the following number series?

    150 160 140 ? 130

    180
    A 120 Correct Answer Incorrect Answer
    B 140 Correct Answer Incorrect Answer
    C 150 Correct Answer Incorrect Answer
    D 170 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    150 + 10 = 160 160 – 20 = 140 140 + 30 = 170 170 – 40 = 130 130 + 50 = 180

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