View Answer & 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.
Convert each letter to its numerical value, and read each pair of values as 2 digit numbers. In each row, the number in the centre equals the difference between the 2 digit values on the left and right.
Start in the top left hand corner and move anti clockwise around the perimeter of the square. Letters are written in alphabetical order, skipping 1 letter, then 2 letters, then 3 etc.
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