This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning). 
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.
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Question: Passage: The Ravens were facing the Tampa Bay Buccaneers, a team with an identical 7-3 record. However, the Ravens were considered favorites going into the game, given that they had never lost at home during the season, and all Tampa Bay wins were against teams with losing records. Still, they did not take this one lightly. After a scoreless first quarter, the Ravens scored first with a field goal. Tampa Bay later tied it, but Baltimore scored two touchdowns, including one on a 65-yard pass from Todd Heap, to have a 17-3 halftime lead. During a scoreless third quarter, a would be long TD-run from Ray Rice was negated by a controversial call of a penalty on Anquan Boldin. Though the Ravens would never score anymore in the game, they managed to hold off Tampa Bay and allow just one touchdown, enough to prevent their lead from being blown.

Answer: How long was Todd Heaps touchdown?


Question: Passage: Coming off their home win over the Falcons, the Rams flew to Paul Brown Stadium for a Week 14 interconference duel with the Cincinnati Bengals.  With QB Marc Bulger out with a concussion and veteran back-up QB Gus Frerotte out with a shoulder injury, rookie QB Brock Berlin got his first NFL start. In the first quarter, St. Louis trailed early as Bengals RB Rudi Johnson got a 1-yard TD run for the only score of the period.  In the second quarter, the Rams continued to trail as kicker Shayne Graham gave Cincinnati a 27-yard field goal for the only score of the period. In the third quarter, St. Louis got on the board as CB Fakhir Brown returned an interception 36&#160;yards for a touchdown, yet the Bengals responded with Graham kicking a 38-yard and a 32-yard field goal.  In the fourth quarter, the Rams tried to come back as kicker Jeff Wilkins managed to get a 50-yard field goal.  However, Cincinnati sealed the win with Graham nailing a 46-yard field goal. This would also be the 5th time this year that the Rams were held to 10 or fewer points. On a positive note, WR Torry Holt went over 1,000 receiving yards for the eighth-straight year.

Answer: How many 30+ yard field goals did Graham make in the third quarter?


Question: Passage: In Eurasia, the Sumerians started to live in villages from about 8,000 BC, relying on the Tigris and Euphrates rivers and a canal system for irrigation. Ploughs appear in pictographs around 3,000 BC; seed-ploughs around 2,300 BC. Farmers grew wheat, barley, vegetables such as lentils and onions, and fruits including dates, grapes, and figs. Ancient Egyptian agriculture relied on the  Nile River and its seasonal flooding. Farming started in the predynastic period at the end of the Paleolithic, after 10,000 BC. Staple food crops were grains such as wheat and barley, alongside industrial crops such as flax and papyrus. Agriculture in India, wheat, barley, and jujube were domesticated by 9,000 BC, soon followed by sheep and goats. Cattle, sheep and goats were domesticated in Mehrgarh by 8,000–6,000 BC. Cotton was cultivated by the 5th-4th millennium BC. There is archeological evidence of an animal-drawn plough from 2,500 BC in the Indus Valley Civilization. Agriculture in China, from the 5th century BC there was a nationwide granary system and widespread sericulture. Water-powered grain mills were in use by  the 1st century BC, followed by irrigation. By the late 2nd century, heavy ploughs had been developed with iron ploughshares and mouldboards. These slowly spread westwards across Eurasia. Asian rice was domesticated 8,200–13,500 years ago in China, with a single genetic origin from the wild rice Oryza rufipogon. Agriculture in ancient Greece and Roman agriculture, the major cereals were wheat, emmer, and barley, alongside vegetables including peas, beans, and olives. Sheep and goats were kept mainly for dairy products.

Answer:
How many years difference is there between the earliest and latest estimate of when Asian rice was domesticated?