Answer

Q

Explanation

Adding the three numbers in each square together gives the numerical value of the letter at the centre of each square

Answer

B

Explanation

In each row of the diagram, the reverse alphabetical value of the central letter equals the sum of the left and right hand digits.

Answer

4

Explanation

Split the left and right hand circles into 2 halves vertically. The numerical value of the letter in the upper left segment of the central circle equals the sum of the numbers in the left half of the left hand circle, and the letter in the lower left equals the sum of the numbers in the right half of the left hand circle. Repeat this pattern for the right hand circle.