Puzzles - Logical puzzles

40.
Answer
:
C
Explanation
:
In each circle, multiply the inverse alphabetical value of the upper left hand letter by the regular alphabetical value of the upper right hand letter to give the value in the lower segment.

41.
Answer
:
5
Explanation
:
Splitting the diagram in half both horizontally and vertically, each quarter contains a pattern of black squares, representing the letters W, X, Y and Z.