Ladies and gentlemen, how to calculate this nine-square grid? The sum of each row and column is the same. How to calculate. I am a novice in mathematics. thank you
Solid square
The numbers of 1-9 are all equal to 15, and the middle number is 5.
therefore
This nine-square grid is:
(6)( 1)(8)
(7)(5)(3)
(2)(9)(4)