SOLUTION:

29

Jacob standing on the middle rung.
He goes up 6 rungs so he is now at M+6 and when he goes down 10 rungs so he is at M-4.
Jacob goes up 18 rungs so he is now at M+14 = T

14 rungs from the top, 14 rungs from the bottom, and the middle rung. 14+14+1=29

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