Let \( x \) be the number of comic books on each shelf before the father adds 20 comic books to the bottom shelf. Since there are 5 shelves, the total number of comic books in his original collection can be expressed as:
\[ 5x \]
After his father adds 20 comic books to the bottom shelf, the number of books on that shelf becomes:
\[ x + 20 \]
According to the problem, the bottom shelf now has 125 comic books. Therefore, we can set up the equation:
\[ x + 20 = 125 \]
To solve for \( x \), subtract 20 from both sides:
\[ x = 125 - 20 \] \[ x = 105 \]
Now, we can find the total number of comic books in Jose's collection by substituting \( x \) back into the expression for the total number of books:
\[ 5x = 5(105) = 525 \]
Thus, the total number of comic books in Jose's collection is:
\[ \boxed{525} \]