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Magic squares · Puzzles and logic · Earlier days

Magic square with a missing centre

Each of the nine small squares of a

3\times 3

grid contains a two-digit number. The top-right square contains

22

, the centre square contains

X

, and the bottom-left square contains

26

; the other six squares are left blank. The sum of the three numbers in each row, each column and both diagonals is the same. Find

X

.

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