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If you add the first and the last number, you have a sum of 101. The second number from the left and the second number from the right will also add up to 101. If you continue in this way, you get 50 pairs of numbers, each of which has a sum of 101, so the final result is 50 x 101.
101
10.1
If you mean: x+2x+17 = 101 then x = 28 which is the number needed