>perl -wMstrict -le
"my $hashref = {
   first  => { foo => 'bar', bar => 'baz', flop => 'floodle' },
   second => { bar => 'foo', baz => 'bar', etc  => 'plodle'  },
   };
 foreach ( keys %{$hashref} ) {
   print qq{$_ contains } . scalar(%{$hashref->{$_}}) . qq{ keys.};
   }
"
first contains 3/8 keys.
second contains 3/8 keys.
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Please note:

• proper string definitions of values of hashes;
•  scalar(%{$hashref->{$_}}) vice  scalar(%{$hashref->{$_});
• per Re^2: num keys of the hash within hash?, the stringization of a hash does not necessarily imply the number of keys of the hash.