A good answer, but please note that the two newlines at the end are part of the header and not a replacement for the two break tags you had listed. To "web enable" your code you should use the code Autark posted but add the your tags in a print statement, like this:

#!/usr/bin/perl -w

use strict;

print "Content-Type: text/plain\n\n";
print "<br><br>\n";
my $add = '152';
print $add / 321 + 4 * $add, "\n";
[download]

But I think it was just part of his formatting inside the code tags...