Question
7Â Â Â 4Â Â Â 5Â Â Â 9Â Â Â 20Â Â Â Â ?Â
   160.5 Find the missing number in the following number series:Solution
7 x 0.5 + 0.5 = 4Â 4 x 1 + 1 = 5Â 5 x 1.5 + 1.5 = 9 9 x 2 + 2 = 20 20 x 2.5 + 2.5 = 52.5 Â 52.5 x 3 + 3 = 160.5
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