Letters A thru I have values 1 thru 9, each with different value.
The sums of the four values are to the right of the rows and under the columns. Since I cant draw visual its a 4X4 square and each row or column will equal given value.
F I C D = 25
C A I G = X
G H B E = 18
B D F A = 17
= = = =
21 Y 23 21