Puzzles - Missing letters puzzles

Exercise : Missing letters puzzles
37.
Answer
:
A
Explanation
:
Converting each letter to its numerical value, the diagram represents a subtraction sum: 247 - 54 = 193.

38.
Answer
:
T
Explanation
:
Starting on the top left, and moving in an anti-clockwise spiral towards the centre, letters advance through the alphabet by 3 letters at a time.

39.
Answer
:
W
Explanation
:
Looking at the diagram in columns, letters in the first column are written with 2 straight lines, in the second column they contain 3 straight lines, and letters in the right hand column are written with 4 straight lines.