Puzzles - Missing letters puzzles

Answer

:

A

Explanation

:

Converting each letter to its numerical value, the diagram represents a subtraction sum: 247 - 54 = 193.

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.

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.