Answer :

F

Explanation :

In each group of 3 boxes, calculate the difference in numerical values between the top two letters, and add 1 to give the value of the letter in the lower box.

Answer :

E

Explanation :

Starting with the bottom row and moving up, one row at a time, the sum of the numerical values of the letters starts at 26 for the bottom row, then 24, 22 and 20 as you move up.

Answer :

K

Explanation :

Add 6 to the numerical value of each of the larger letters, and write the letter with this value in the smaller square diagonally opposite.

Answer :

Q

Explanation :

Converting all letters to their numerical values, the middle section of each row of the diagram contains a list of letters which are common multiples of a number, given by the value of the letter in the right hand box. One letter

Answer :

H

Explanation :

In each diagram, add the numerical value of the upper right and left letters to the lower right and left letters, to give the letters in the centre of the columns. Calculate the difference between these middle letters to give the