TASK DEFINITION: This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.
PROBLEM: Passage: According to ISTAT, in 2014 there were 154,356 people residing in Cagliari (+3.0% compared with 2011), of whom 71,522 were male and 82,834 female for a sex ratio of 0.86. Minors (children aged 18 and younger) totalled 12.92% of the population, compared to pensioners at 24.81%. The average age of Cagliari residents is 47.44. The ratio of the population over 65 years of age to that under the age of 18, is 53.39%. The elderly population, defined as being over 65 years of age, has increased by 21.95% over the last 10 years. The current birth rate in Cagliari is 6.29 births per 1,000 inhabitants. The average number of people of any age per household is 2.11 and the percentage of households composed of a single person is 42.53%. The population of Cagliari is structured like that of other first world countries, especially as to the prevalence of an elderly population. The trend of these rates in the Cagliari metropolitan area is proportionally reversed in the suburbs, where most younger families move. 
Question: How many percent of households are not composed of a single person? 
Answer type: Number 

SOLUTION: 57.47.

PROBLEM: Passage: The Cham also requested Ming China to intervene by helping bring the Vietnamese back in line by force and demarcate the border between Champa and Vietnam. China, however, only verbally rebuked the Vietnamese for its incursion, which the Vietnamese ignored, proceeding with its attack and plan to destroy its rival. The Vietnamese then carried out its campaign. On November 28, 1470, Le Thanh Tong formally launched his attack as a 100,000-strong Vietnamese naval expedition set out that day, followed by another Vietnamese army consisting of 150,000 men on December 8. The Vietnamese army was reorganized to copy the Chinese army, armed with gunpowder weapons. Le Thanh Tong raised a total of 300,000-strong army in the battlefied and, significantly outnumbering the 100,000-strong Cham army. This came at a massive financial cost since it drained the Vietnamese treasury of 1,000 gold liang each day. However, it decisively won the war. 
Question: After formally launching an attack, how many days later did Le Thanh Tong increase his army? 
Answer type: Number 

SOLUTION: 10.

PROBLEM: Passage: The first archaeological findings around the lake belong to nomadic people living in the area in prehistoric types. The first settlements discovered date from the Copper Age. The area was later under the control of the Ligures, later replaced by the Celts. The latter were in turn conquered by the Romans, who called the lake Verbanus Lacus or Lacus Maximus. After the fall of the Western Roman Empire, the lake was under different dominations. Most of the current settlements originated in the Middle Ages, when the lake was under the Della Torre, Visconti, the Borromeo and Habsburg families. Methane was first discovered and isolated by Alessandro Volta as he analysed marsh gas from Lake Maggiore, between 1776 and 1778. In 1936, a Bugatti Type 22 Brescia Roadster, built 1925, was sunk in the lake by employees of Zürich architect Marco Schmucklerski, when Swiss custom officials investigated whether he had paid taxes on the car. The Bugatti was attached to an iron chain making it possible to recover it once the investigation was over, yet that never happened. When the chain corroded, the car sunk to the lake bed, where it was rediscovered on 18 August 1967 by local diver Ugo Pillon and became a favourite target for divers thereafter. When one of the divers, Damiano Tamagni, was killed in a hold-up on 1 February 2008, his friends from the Ascona divers' club decided to lift and sell the carwreck to raise funds for a yet to be created foundation named after the victim. The remains of the Bugatti were recovered on 12 July 2009. The sale took place at the Retro Mobile classic car exhibition in Paris on 23 January 2010. It was sold for €260,500. 
Question: How many years passed between the car being built and it being sunken into the lake? 
Answer type: Number 

SOLUTION:
11.