Twenty Houses

Riddle: If you counted 20 houses going to school, and then 20 houses on the left, going home. How many houses have you counted?

Answer: 20. They're the same houses going back.

Source: https://www.riddles.com/index.php/946

If you counted 20 houses going to school, and then 20 houses on the left, going home. How many houses have you counted? — Twenty Houses by Anonymous v1.

Riddle: If you counted 20 houses going to school, and then 20 houses on the left, going home. How many houses have you counted? Answer: 20. They're the same houses going back. — by Anonymous v2.