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.

Q: Passage: As of the census of 2010, there were 47,723 people, 17,816 households, and 11,722 families residing in the city. The population density was 1,754.6/sq mi (677.5/km²).  There were 19,806 housing units at an average density of 749.9 per square mile (289.6/km²).  The racial makeup of the city was 38.32% White (U.S. Census), 57.25% African American (U.S. Census), 1.25% Native American (U.S. Census), 1.85% Asian, 0.14% Pacific Islander (U.S. Census), 1.03% from Race (United States Census), and 1.09% from two or more races.  6.98% of the population were Hispanics in the United States or Latino (U.S. Census) of any race. 
Question: How many fewer households were there compared to housing units? 
Answer type: Number 

A: 1990.
****
Q: Passage: Petrova was ranked world No. 76 going into the 2003 French Open. In the first round she beat the three-time champion and world No. 12 Monica Seles 6-4, 6-0, on what was to be Seles last professional match. She then defeated Silvija Talaja 6-1, 6-1 and Marissa Irvin 6-1, 6-1 to reach the fourth round. Here, Petrova stunned 7th seed Jennifer Capriati 6-3, 4-6, 6-3. In the quarterfinals, Petrova won again in three sets over 21st seed Vera Zvonareva 6-1, 4-6, 6-3 to reach her first ever Grand Slam semifinal. Petrova faced world No. 2, Kim Clijsters, and despite having a set point in the first set, Petrova was beaton in straight sets 7-5, 6-1. Despite this, Petrovas ranking increased to world No. 30. 
Question: How many total games did Petrova play in all matches combined? 
Answer type: Number 

A: 117.
****
Q: Passage: After a tough road win over the Bolts, the Steelers returned home to take on the Cardinals.  The Cards would strike first in the first quarter when Carson Palmer found Michael Floyd on a 3-yard pass for a 7-0 lead for the only score of the period.  The Steelers got on the board in the 2nd quarter when Chris Boswell nailed a 47-yard field goal for a 7-3 game before the Cards moved ahead by a TD after Chandler Catanzaro kicked a field goal of his own from 31 yards out for a 10-3 game at halftime.  After the break, in the third quarter it was all Steelers as Boswell kicked another field goal.  This was from 48 yards out to get the Steelers within 4, 10-6.  3rd-string QB Landry Jones replaced Michael Vick for the rest of the game and threw his first career TD to Martavis Bryant from 8 yards out (with a failed 2-point conversion) and a 12-10 lead.  Boswell hit a field goal from 51 yards out to send the Steelers up by 5, 15-10.  In the fourth quarter, the Cards narrowed the Steelers' lead as Catanzaro kicked a 39-yard field goal for a 15-13 game.  The Steelers increased their lead when Boswell made a 28-yard field goal for an 18-13 game.  Finally, they were able to seal the game when Jones found Bryant on an 88-yard pass for the final score of 25-13. With the win, the Steelers improved to 4-2.  The defense also continued their stellar outings in sacks and takeaways such as sacking Palmer once, picking him off twice, and recovering a fumble. 
Question: How many points were scored in the first half? 
Answer type: Number 

A:
13.
****