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Extreme Excavations.

Answer to the Puzzle ... 117 = ?

IF:     111 = 13
          112 = 24
          113 = 35
          114 = 46
          115 = 57

Then: 117 = ??

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Answer: 79

Logic is in this format : <last digit><sum of all digits>

∴ Answer to this number puzzle will be 79.