Question

i need help on a 5x5 magic square

Answer 1

What are the knowns (and where)?

Answer 2

The magic constant of a square of size nxn is
\[M=\frac{n(n^2+1)}{2}\]So in your case:\[M=\frac{5(25+1)}{2}=\frac{130}{2}=65\]