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.

[Q]: Passage: Over the years the city has been home to people of various ethnicities, resulting in a range of different traditions and cultural practices. In one decade, the population increased from 427,045 in 1991 to 671,805 in 2001. The population was projected to reach 915,071 in 2011 and 1,319,597 by 2021. To keep up this population growth, the KMC-controlled area of  has expanded to  in 2001. With this new area, the population density which was 85 in 1991 is still 85 in 2001; it is likely to jump to 111 in 2011 and 161 in 2021.
[A]: How many more people populated the city in 2001 than in 1991?


[Q]: Passage: On September 8, 2007, the Cats defeated the St. Paul Saints 4-1 in the fifth game of the American Association Championship playoffs to capture a second straight American Association Championship and third straight overall. The Cats had won 6 straight decisive Game 5s and were 13-0 in games in which they faced elimination the last 3 seasons. They had been down 2 games to 1 in 5 of the last 6 series following a pattern of winning the first game, losing the next two, and then winning games 4 and 5. The only exception was when they were down 2-0 to the El Paso Diablos in the 2007 Division Series before winning 3 straight at LaGrave Field. The 2007 regular season record was 53-40 with a 0.570 winning percentage. Total season attendance was 141,330 for 34 games, which was an average of 4,157 per game. Max Scherzer was on the Cats roster in 2007. In 2008, he was called up to the Arizona Diamondbacks.
[A]: How many more games did the Cats defeat the St Paul Saints?


[Q]: Passage: Direct U.S. military involvement ended on 15 August 1973 as a result of the Case-Church Amendment passed by the U.S. Congress. The fall of Saigon by the North Vietnamese Army in April 1975 marked the end of the war, and North and South Vietnam were reunified the following year. The war exacted a huge human cost in terms of fatalities (see Vietnam War casualties). Estimates of the number of Vietnamese soldiers and civilians killed vary from 966,000 to 3.8 million. Some 275,000-310,000 Khmer people, 20,000-62,000 Lao people, and 58,220 U.S. service members also died in the conflict, and a further 1,626 remain missing in action. The Sino-Soviet split re-emerged following the lull during the Vietnam War and ties between the DRV and its Cambodian allies in the GRUNK, the newly-formed Democratic Kampuchea begun almost immediately in a series of border raids by the Khmer Rouge and erupted into the Cambodian-Vietnamese War, with Peoples Liberation Army directly intervening in the Sino-Vietnamese War. The end of the war and resumption of the Third Indochina War would precipitate the Vietnamese boat people and the bigger Indochina refugee crisis, which saw an estimated 250,000 people perish at sea.
[A]:
How many years after U.S. military involvement ended did the Vietnam War end?