20. The school is farther/further from the office than the hairdresser's.

The correct word is **further**. *Explanation:* 'Further' is generally used to describe metaphorical or non-physical distances, while 'farther' is used for physical distances. However, 'further' can also be used for physical distances, especially in formal writing. In this case, 'further' is a more common and generally accepted choice. **Translation:** Школа находится дальше от офиса, чем парикмахерская.