Please see attached file
The following three by three grid contains the number 3/8 in the upper left-hand corner and the number 1/4 in the last column of the second row as shown.
3/8 a b
c d 1/4
e f g
Find the other seven numbers in the grid such that the sum of all the rows, columns and diagonals is 1.
This provides an example of completing a number logic puzzle.