Question: How many kilometers is the coastal town, located within the Electoral district of Gosford, north of Sydney?
Sentence (from "Anuradhapura East Electoral District"): The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Anuradhapura East electoral district was replaced by the Anuradhapura multi-member electoral district at the 1989 general elections, the first under the proportional representation system, though Anuradhapura continues to be a polling division of the multi-member electoral district.
Relevant evidence: No