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Magic 7

Age 11 to 14 Short
Challenge Level


In this magic square, which uses all the integers from $7$ to $15$, each of the rows, columns and the two main diagonals has the same total.
 

Which number replaces $n$ in the completed square?




If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.

This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.