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diff --git a/challenge-320/peter-campbell-smith/blog.txt b/challenge-320/peter-campbell-smith/blog.txt
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+http://ccgi.campbellsmiths.force9.co.uk/challenge/320
diff --git a/challenge-320/peter-campbell-smith/perl/ch-1.pl b/challenge-320/peter-campbell-smith/perl/ch-1.pl
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+#!/usr/bin/perl
+
+# Blog: http://ccgi.campbellsmiths.force9.co.uk/challenge
+
+use v5.26;    # The Weekly Challenge - 2025-05-05
+use utf8;     # Week 320 - task 1 - Maximum count
+use warnings; # Peter Campbell Smith
+binmode STDOUT, ':utf8';
+use Encode;
+
+maximum_count(-3, -2, -1, 1, 2, 3);
+maximum_count(-2, -1, 0, 0, 1);
+maximum_count(1, 2, 3, 4);
+maximum_count(0, 0, 0);
+
+# larger example
+my @nums;
+push @nums, int(rand(41)) - 20 for 0 .. 99;
+maximum_count(@nums);
+
+sub maximum_count {
+	
+	my %count = (pos => 0, neg => 0, zero => 0);
+	
+	# count +ves, -ves and 0s
+	$count{$_ < 0 ? 'neg' : ($_ > 0 ? 'pos' : 'zero')} ++ for @_;
+	
+	# report
+	say qq[\nInput:  (] . join (', ', @_) . ')';;
+	say qq[Output: ] . ($count{pos} > $count{neg} ? $count{pos} : $count{neg}) .
+		qq[ ($count{neg} negative, $count{pos} positive, $count{zero} zero)];
+}
diff --git a/challenge-320/peter-campbell-smith/perl/ch-2.pl b/challenge-320/peter-campbell-smith/perl/ch-2.pl
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+#!/usr/bin/perl
+
+# Blog: http://ccgi.campbellsmiths.force9.co.uk/challenge
+
+use v5.26;    # The Weekly Challenge - 2025-05-05
+use utf8;     # Week 320 - task 2 - Sum difference
+use warnings; # Peter Campbell Smith
+binmode STDOUT, ':utf8';
+use Encode;
+
+sum_difference(1, 23, 4, 5);
+sum_difference(1, 2, 3, 4, 5);
+sum_difference(1, 2, 34);
+
+# larger example
+my @nums;
+push @nums, int(rand(1000)) for 0 .. 99;
+sum_difference(@nums);
+
+sub sum_difference {
+	
+	my (@integers, $elements, $digits);
+	@integers = @_;
+	
+	# make the desired sums
+	$elements += $_ for @integers;
+	$digits = eval(join('+', split('', join('', @integers))));
+	
+	say qq[\nInput:  (] . join(', ', @integers) . q[)];
+	say qq[Output: ] . ($elements - $digits) . qq[ (elements = $elements, digits = $digits)];
+}