Twenty Seven Ducks

Riddle: Twenty-seven ducks are going to the pond. Five of them got lost, thirteen of them are staying home, nine of them are at the pond. Where are the rest of them?

Answer: There aren't any anywhere else.

Source: https://www.riddles.com/1211

Twenty-seven ducks are going to the pond. Five of them got lost, thirteen of them are staying home, nine of them are at the pond.
Where are the rest of them? — Twenty Seven Ducks by Anonymous v1.

Riddle: Twenty-seven ducks are going to the pond. Five of them got lost, thirteen of them are staying home, nine of them are at the pond.
Where are the rest of them? Answer: There aren't any anywhere else. — by Anonymous v2.