What letter should replace the question mark? PTD FYS KNC BTR M?H

Question

What number should replace the question mark?

27 28 32
93 54 40
48 64 48
67 84 64
55 50 ?

Answer 1

U
PTD FYS KNC BTR MUH
The value of the alphabet in the middle is the addition of the value of the letters outwards.
so, M is 13 and H is 8
13+8 = 21
nd, 21st alphabet is U