How do. I solve the problem below?

Question

Fill in the boxes with the numbers 1,3,5,7,9,11,13,15,and17 such that the sum of the numbers in the horizontal,vertical and diagonal positions are the same. Each number can only be used once. 

Answer 1

 

  7          5           15

 17         9            1

  3         13           11

 

 

Let me know if you need an explanation!