1998 CEMC Gauss (Grade 7) Problems/Problem 15
The diagram shows a magic square in which the sums of the numbers in any row, column or diagonal are equal. What is the value of n?
[A 3x3 magic square grid is shown. 8 is in the 1st row 1st column. 9 is in the 2nd row 1st column. 4 is in the 2nd row 3rd column. 4 is in the 3rd row 1st column. is in the 3rd row 2nd column.]
The "magic" sum is so the center square (2nd row 2nd column) is
The square in the lower right (3rd row 3rd column) has value 6, therefore
The answer is