A square array of numbers is said to be a magic square, if the sum of the numbers in
each of its row, column and main diagonals is equal. In the following 4x4 magic square,
find (a + b + c + d) if the sum of the remaining 12 entries is 150.
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The number 15 is called the magic number of the 3x3 square. You can also achieve 15, if you add the middle number 5 three times. The odd numbers 1,3,7, and 9 occur twice in the reductions, the even numbers 2,4,6,8 three times and the number 5 once.
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Answer of this question is 25
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