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**Magic Square**

Hello,

Don't know, which forum, so i put it to general...

Yesterday i saw something like an magician on an exposition, showing some math to angle for attention.

He asked the audience to give him a number between 41 and 100. So he got the 47.

He worked out a magic square _very_ quickly.

It was that one:

4 18 14 11

15 10 5 17

9 12 20 6

19 7 8 13

You see, that the horizontal lines, the vertical lines, and all possible 2x2 - squares have the sum of 47...

How did the magician do that?

I've found some links here:

http://mathworld.wolfram.com/MagicSquare.html

http://en.wikipedia.org/wiki/Magic_Square

But i don't know how to adapt the instructions for constructing an squad with doubly even order to other sums of the lines, etc ..

Can someone please help me?

It would be great :-)

greets

Soeren

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