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  SOLUTION #1

    1  3  8 19 ?
    5 14 35 80 ?

    first row
      1
      1 * 2 + 1 = 3
      3 * 2 + 2 = 8
      8 * 2 + 3 = 19
     19 * 2 + 4 = 42 <-- missing number
    (42 * 2 + 5 = 89)

    second row
      1 * 2 +  3 = 5
      3 * 2 +  8 = 14
      8 * 2 + 19 = 35
     19 * 2 + 42 = 80
     42 * 2 + 89 = 173 <-- missing number


    42 + 173 = 215

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   SOLUTION #2

   Uses the "difference approach".
   3 - 1 = 2
   8 - 3 = 5
   19 - 8 = 11
   and so on...

   Go up (and down) until a pattern emerges.
   Continue the pattern and calculate the missing number.

   39 + 161 = 200

   Thanks to Duncan Williamson for this solution.

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