question: What is the postcode of a town in Cook County, New South Wales, that is situated approximately 100 km west of the Sydney central business district, and about 8 km east of Katoomba?
answer: 2782
context: Title: Cook County, New South Wales
  Passage: Cook County was one of the original Nineteen Counties in New South Wales and is now one of the 141 Cadastral divisions of New South Wales.  It includes the area to the west of Sydney in the Blue Mountains, between the Colo River in the north, and the Coxs River in the south and west, encompassing Lithgow, Mount Victoria, Katoomba, Wentworth Falls, Lawson and most of the other towns in the Blue Mountains.  The Nepean River is the border to the east.  Before 1834, the area was part of the Westmoreland, Northumberland and Roxburgh counties. 
  Title: Wentworth Falls, New South Wales
  Passage: Wentworth Falls (postcode: 2782) is a town in the Blue Mountains region of New South Wales, situated approximately 100 km west of the Sydney central business district, and about 8 km east of Katoomba, Australia on the Great Western Highway, with a Wentworth Falls railway station on the Main Western line.  The town is at an elevation of 867 m   .  At the 2011 census , Wentworth Falls had a population of .
  Title: Bell, New South Wales
  Passage: Bell (postcode: 2786) is a small rural and residential village in the Blue Mountains region of New South Wales, Australia.  It is the north-westernmost village in the City of Blue Mountains, located approximately 125 km west of Sydney central business district by road or 137 km by rail, approximately 20 km east of Lithgow and 10 km north of Mount Victoria.  It is a locality on the junction of the Bells Line of Road, Chifley Road and the Darling Causeway, with an elevation of approximately 1100 m   .
  Title: Jenolan Caves
  Passage: The Jenolan Caves (Tharawal: Binoomea, Bindo, Binda) are limestone caves located within the Jenolan Karst Conservation Reserve in the Central Tablelands region, west of the Blue Mountains, in New South Wales, in eastern Australia.  The caves and 3083 ha reserve are situated approximately 175 km west of Sydney, 20 km east of Oberon and 30 km west of Katoomba.
citations: Cook County, New South Wales Wentworth Falls, New South Wales