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'X Is 5 Squares' printed from http://nrich.maths.org/
Can you arrange $5$ different digits (from $0$ to $9$) in the
cross so that
- the total of the $4$ outside numbers is equal to the middle
- the top $2$ numbers multiplied together are also equal to the
- the sum of the $3$ numbers forming a diagonal is equal to the
other $3$ numbers forming the other diagonal.