Problem: The oldest securely dated tin bronze artefact are found in the heart of the Balkans in Serbia. A tin bronze foil from the Plocnik are dated to 4650 BC. The foil are not the only tin bronze artefact from the fifth millennium BC. 14 other artefacts from Serbia and Bulgaria are dated to before 4000 BC. The recent discoveries indicate that early tin bronze was more common than previously thought, and developed independently in Europe 1500 years before the first tin bronze alloys in the Near East. The production of complex tin bronzes lasted for c. 500 years in the Balkans. Shortly before the end of the fifth millennium BC, there are no longer evidence for production of tin bronze. This coincides with the collapse of large cultural complexes in the Balkans.Tin bronze would be reintroduced to the area again some 1500 years later.
Answer this question based on the article: How many countries can you find artifacts that are dated to before 4000 BC?
A: 2

Problem: As of the census of 2000, there were 83,955 people, 32,023 households, and 21,647 families residing in the county. The population density was 64 people per square mile (25/km). There were 39,839 housing units at an average density of 30 per square mile (12/km). The racial makeup of the county was 94.63% Race (United States Census), 1.06% Race (United States Census) or Race (United States Census), 2.60% Race (United States Census), 0.46% Race (United States Census), 0.02% Race (United States Census), 0.23% from Race (United States Census), and 1.01% from two or more races. 0.94% of the population were Hispanics in the United States or Race (United States Census) of any race. 26.8% were of Germans, 13.2% Irish people, 11.3% English people, 9.1% Polish people, 8.2% Italian people and 7.4% United States ancestry according to Census 2000. 95.2% spoke English language and 1.4% Spanish language as their first language.
Answer this question based on the article: Which ancestry groups each made up more than 9% of the population?
A: Polish

Problem: Barnard Castle has road connections to Bishop Auckland, Spennymoor and central County Durham via the A688 and Darlington, Stockton-on-Tees, and Middlesbrough by the A67. Barnard Castle is also four miles from the A66, with access to the M6 to the west and the A1 to the east. The B6278 also connects Barnard Castle with Middleton-in-Teesdale. Barnard Castle railway station was closed for passenger trains in 1964. A Bill was approved in 1854 for a line from a junction with the Stockton & Darlington Railway at Darlington to Barnard Castle and opened on 9 July 1856, with intermediate stations at Broomielaw, Winston, Gainford & Piercebridge. The terminus at Darlington only lasted five years. In 1856 the South Durham & Lancashire Railway proposed a line from Bishop Auckland to Tebay via Barnard Castle and Kirkby Stephen but only the western section was built with the Company receiving its Bill in 1857. The line opened on 8 August 1861 from a second terminus at Barnard Castle to a junction with the Lancaster & Carlisle Railway at Tebay with intermediate stations at Lartington, Bowes, Barras, Kirkby Stephen, Ravenstondale & Gaisgill. The two stations at Barnard Castle were some distance apart; the earliest station became a through station and closed to passengers on 1 May 1862, but remained in use as a goods depot. The second station was closed for passenger trains under the Beeching cuts in 1964 and completely on 5 April 1965 and the site was eventually built on by Glaxo Smith Kline. Today rail access is via Bishop Auckland, 15miles or Darlington, 16miles .
Answer this question based on the article: How many years after the first Barnard Castle line opened did the second line open?
A:
5