the primary question is why doesn't the following construct work:
(@junk, $ads) = (split(/\s+/, $rec));
Think of the @junk array as being "greedy": it swallows up all of the list elements returned by split, leaving none for your $ads scalar.
Update: yet another way, without the temporary @junk array:
use strict;
use warnings;
my $rec = 'a b c d 96';
my $ads = (split /\s+/, $rec)[-1];
print "ads=$ads\n";
__END__
ads=96
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