High School

Find the rank of the matrix:

\[
\begin{bmatrix}
91 & 92 & 93 & 94 & 95 \\
92 & 93 & 94 & 95 & 96 \\
93 & 94 & 95 & 96 & 97 \\
94 & 95 & 96 & 97 & 98 \\
95 & 96 & 97 & 98 & 99
\end{bmatrix}
\]