Given the following passage "As of January 2008, Spain is the nation with the most elevators installed in the world, with 950,000 elevators installed that run more than one hundred million lifts every day, followed by United States with 700,000 elevators installed and China with 610,000 elevators installed since 1949. In Brazil, it is estimated that there are approximately 300,000 elevators currently in operation. The world's largest market for elevators is Italy, with more than 1,629 million euros of sales and 1,224 million euros of internal market.", answer the following question. Note that the answer is present within the text. Question: Which country has an estimated number of elevators that is more than 250,000, but less than 500,000?
Ans: Brazil

Given the following passage "Alfred North Whitehead was born in Ramsgate, Kent, England, in 1861. His father, Alfred Whitehead, was a minister and schoolmaster of Chatham House Academy, a successful school for boys established by Thomas Whitehead, Alfred North's grandfather. Whitehead himself recalled both of them as being very successful schoolmasters, but that his grandfather was the more extraordinary man. Whitehead's mother was Maria Sarah Whitehead, formerly Maria Sarah Buckmaster. Whitehead was apparently not particularly close with his mother, as he never mentioned her in any of his writings, and there is evidence that Whitehead's wife, Evelyn, had a low opinion of her.", answer the following question. Note that the answer is present within the text. Question: Who lived with Alfred Whitehead?
Ans: Evelyn

Given the following passage "In 2013 a lot of media coverage was given to unclassified NSA's study in Cryptologic Spectrum that concluded that Tito did not speak the language as a native, and had features of other Slavic languages (Russian and Polish). The hypothesis that "a non-Yugoslav, perhaps a Russian or a Pole" assumed Tito's identity was included. The report also notes Draza Mihailovic's impressions of Tito's Russian origins.", answer the following question. Note that the answer is present within the text. Question: What led everyone to decide Tito was not who he claimed to be?
Ans: NSA's study in Cryptologic Spectrum that concluded that Tito did not speak the language as a native

Given the following passage "It was only in the 1980s that digital telephony transmission networks became possible, such as with ISDN networks, assuring a minimum bit rate (usually 128 kilobits/s) for compressed video and audio transmission. During this time, there was also research into other forms of digital video and audio communication. Many of these technologies, such as the Media space, are not as widely used today as videoconferencing but were still an important area of research. The first dedicated systems started to appear in the market as ISDN networks were expanding throughout the world. One of the first commercial videoconferencing systems sold to companies came from PictureTel Corp., which had an Initial Public Offering in November, 1984.", answer the following question. Note that the answer is present within the text. Question: What service did PictureTel Corp. provide?
Ans: commercial videoconferencing systems