( e.g. 4+3+8=15 )
3 x 3 Magic Square for 15

A Magic Square consists of a square array of numbers, whose row, column and diagonal and skew-diagonal sums add to the same number.

Each square should have a distinct non-zero positive integer. No two squares should have the same integer.

(22 + 12 + 18 + 87 = 139)

Magic Square

In a Date Magic square, the date of birth: 22-12-1887 is written as four numbers in four squares.

The following are sequences of pairs of numbers in square boxes:

22 + 87 = 27 + 82 (a choice)
12 + 18 = 4  + 26  (a choice)
  4 + 87 = 84 + 7  (a choice)
22 + 26 = 16 + 32 (a choice)
  4 + 22 = 24 + 2  (a choice)

2nd row:

139 - 84 - 32 - 2 = 21
139 - 16 - 7 -24 = 92.