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Just magic

Joe has been showing Penny how to calculate the numbers in a 3-by-3 magic square. Each row, column and main diagonal have the same totals. On the left is Penny’s first effort. But she thought it would make a good puzzle if all but one number were in the wrong position.

Which number is in its correct position?

WIN £15 will be awarded to the sender of the first correct answer opened on Wednesday 6 January. The Editor’s decision is final. Please send entries to Enigma 1572, New Å®ÉúСÊÓƵ, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).

Answer to 1566 Consistently older: Harry’s current age is 57

The winner Neil Hodgson of Highclere, Berkshire, UK