Problem: London:

Greater London's population declined steadily in the decades after the Second World War, from an estimated peak of 8.6 million in 1939 to around 6.8 million in the 1980s. The principal ports for London moved downstream to Felixstowe and Tilbury, with the London Docklands area becoming a focus for regeneration, including the Canary Wharf development. This was borne out of London's ever-increasing role as a major international financial centre during the 1980s. The Thames Barrier was completed in the 1980s to protect London against tidal surges from the North Sea.

What was the primary function of the Thames Barrier?
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A: to protect London against tidal surges from the North Sea

Problem: The abacus was initially used for arithmetic tasks. The Roman abacus was used in Babylonia as early as 2400 BC. Since then, many other forms of reckoning boards or tables have been invented. In a medieval European counting house, a checkered cloth would be placed on a table, and markers moved around on it according to certain rules, as an aid to calculating sums of money.
When was the Roman abacus first used?
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Answer: 2400 BC

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Many nonprofit organizations find it difficult to create consistent messaging that resonates with their various stakeholders as marketing budgets are minimal or nonexistent. Marketing is in many cases a taboo word that NPOs or others don't like to associate with such community benefit organizations. There are strategic ways in which nonprofits can leverage their access to various community stakeholders to get their name and cause recognized by the public, but it is imperative to have an outreach strategy which includes a financial plan to execute that outreach/marketing strategy, particularly if the organization has plans to rebrand or expand their initiaives.
What does an NPO need to have in order to begin thinking about expansion or rebranding?
A: an outreach strategy which includes a financial plan to execute that outreach/marketing strategy

Context and question: Historically, in North America, one of the most economically destructive pests in cotton production has been the boll weevil. Due to the US Department of Agriculture's highly successful Boll Weevil Eradication Program (BWEP), this pest has been eliminated from cotton in most of the United States. This program, along with the introduction of genetically engineered Bt cotton (which contains a bacterial gene that codes for a plant-produced protein that is toxic to a number of pests such as cotton bollworm and pink bollworm), has allowed a reduction in the use of synthetic insecticides.
What insect is the most destructive pest in cotton growing in the BWEP?
Answer: unanswerable

Question: The Somerset Coal Canal was built in the early 19th century to reduce the cost of transportation of coal and other heavy produce. The first 16 kilometres (10 mi), running from a junction with the Kennet and Avon Canal, along the Cam valley, to a terminal basin at Paulton, were in use by 1805, together with several tramways. A planned 11.7 km (7.3 mi) branch to Midford was never built, but in 1815 a tramway was laid along its towing path. In 1871 the tramway was purchased by the Somerset and Dorset Joint Railway (S&DJR), and operated until the 1950s.
Is there an answer to this question: Who purchased the tramway in 1871

Answer: In 1871 the tramway was purchased by the Somerset and Dorset Joint Railway (S&DJR), and operated until the 1950s

Problem: History of India:

During the British Raj, famines in India, often attributed to failed government policies, were some of the worst ever recorded, including the Great Famine of 187678 in which 6.1 million to 10.3 million people died and the Indian famine of 18991900 in which 1.25 to 10 million people died. The Third Plague Pandemic in the mid-19th century killed 10 million people in India. Despite persistent diseases and famines, the population of the Indian subcontinent, which stood at about 125 million in 1750, had reached 389 million by 1941.

How many people died in the Indian Famine of 1899-1900?
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A:
1.25 to 10 million