Problem: Green:

To create green sparks, fireworks use barium salts, such as barium chlorate, barium nitrate crystals, or barium chloride, also used for green fireplace logs. Copper salts typically burn blue, but cupric chloride (also known as "campfire blue") can also produce green flames. Green pyrotechnic flares can use a mix ratio 75:25 of boron and potassium nitrate. Smoke can be turned green by a mixture: solvent yellow 33, solvent green 3, lactose, magnesium carbonate plus sodium carbonate added to potassium chlorate.

What is the ratio of yellow to green in green smoke?
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A: unanswerable


Problem: The United States accused Manuel Noriega's government in Panama of being a "narcokleptocracy", a corrupt government profiting on illegal drug trade. Later the U.S. invaded Panama and captured Noriega.
What country did Noriega rule?
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Answer: Panama


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
A number of world-leading education institutions are based in London. In the 2014/15 QS World University Rankings, Imperial College London is ranked joint 2nd in the world (alongside The University of Cambridge), University College London (UCL) is ranked 5th, and King's College London (KCL) is ranked 16th. The London School of Economics has been described as the world's leading social science institution for both teaching and research. The London Business School is considered one of the world's leading business schools and in 2015 its MBA programme was ranked second best in the world by the Financial Times.
What school in London shares the rank of 2nd best in the world with the famous University of Cambridge in the 2014-2015 World University Rankings?
A: Imperial College London


Context and question: Santa Monica is a beachfront city in western Los Angeles County, California, United States. The city is named after the Christian saint, Monica. Situated on Santa Monica Bay, it is bordered on three sides by the city of Los Angeles – Pacific Palisades to the north, Brentwood on the northeast, Sawtelle on the east, Mar Vista on the southeast, and Venice on the south. Santa Monica is well known for its affluent single-family neighborhoods but also has many neighborhoods consisting primarily of condominiums and apartments. Over two-thirds of Santa Monica's residents are renters. The Census Bureau population for Santa Monica in 2010 was 89,736.
Approximately how many residents of Santa Monica rent their property?
Answer: two-thirds


Question: The Cold War drew to a close in the late 1980s and the early 1990s. The United States under President Ronald Reagan increased diplomatic, military, and economic pressure on the Soviet Union, which was already suffering from severe economic stagnation. In the second half of the 1980s, newly appointed Soviet leader Mikhail Gorbachev introduced the perestroika and glasnost reforms. The Soviet Union collapsed in 1991, leaving the United States as the dominant military power, though Russia retained much of the massive Soviet nuclear arsenal.
Is there an answer to this question: What was  the Soviet Union suffering from in the 1980's?

Answer: severe economic stagnation


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
By the early 1940s, the company was concentrating on lower-budget productions that were the company's main staple: westerns, melodramas, serials and sequels to the studio's horror pictures, the latter now solely B pictures. The studio fostered many series: The Dead End Kids and Little Tough Guys action features and serials (1938–43); the comic adventures of infant Baby Sandy (1938–41); comedies with Hugh Herbert (1938–42) and The Ritz Brothers (1940–43); musicals with Robert Paige, Jane Frazee, The Andrews Sisters, and The Merry Macs (1938–45); and westerns with Tom Mix (1932–33), Buck Jones (1933–36), Bob Baker (1938–39), Johnny Mack Brown (1938–43); Rod Cameron (1944–45), and Kirby Grant (1946–47).
When did The Dead End Guys run?
A:
unanswerable