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    Question

    7      4      5      9      20       ? 

         160.5 Find the missing number in the following number series:
    A 54.2 Correct Answer Incorrect Answer
    B 52.5 Correct Answer Incorrect Answer
    C 55 Correct Answer Incorrect Answer
    D 50.5 Correct Answer Incorrect Answer

    Solution

    7 x 0.5 + 0.5 = 4  4 x 1 + 1 = 5  5 x 1.5 + 1.5 = 9 9 x 2 + 2 = 20 20 x 2.5 + 2.5 = 52.5   52.5 x 3 + 3 = 160.5

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