You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you will be shown an extract from a movie plot. You need to read the extract and create questions that can be answered from the extract. Once you create a question you also need to provide the correct answer for it. Write your answer like "Question: your question, Answer: your answer". The questions should be well-formed and grammatically correct. The questions should be completely answerable from the given passage and should not require any external knowledge. Subjective questions are not allowed. Short answers containing words that are present in the passage are preferred. Create questions that result in factoid answers.  A simple rule of thumb to decide whether a question is a factoid or not is to see if two different people with average reading/comprehension skills would come up with the same answer after reading the passage.

Twenty-year-old Will Hunting of South Boston is a self-taught, genius-level intellect, though he works as a janitor at the Massachusetts Institute of Technology and spends his free time drinking with his friends, Chuckie (Ben Affleck), Billy (Cole Hauser) and Morgan (Casey Affleck). When Professor Gerald Lambeau (Stellan Skarsgård) posts a difficult mathematics problem as a challenge for his graduate students, Will solves the problem anonymously, stunning both the graduate students and Lambeau himself. As a challenge to the unknown genius, Lambeau posts an even more difficult problem. Lambeau chances upon Will solving the problem but Will flees the scene. That night at a bar, Will meets Skylar (Minnie Driver), a British student about to graduate from Harvard, who plans on attending medical school at Stanford and gives Will her phone number before leaving.
Solution: Question: How old is Will Hunting in the movie ?, Answer: Twenty years
Why? This is a good question which results in a factoid answer, and the answer is correct too.

New input: Mike and Carol Brady have a savings account, which both spouses planned to use to bankroll a vacation for the other; Carol wanted to take Mike to Greece, while Mike wanted to treat Carol to a trip to Japan. When they realize their ideas collide, they use the money to try to reunite the entire family for Christmas by paying for airline tickets for their children, grandchildren and their children's spouses.However, all of the Brady kids are facing personal obstacles that might keep them from enjoying the festivities: Greg's wife Nora is spending Christmas with her family; Peter is romantically involved with his boss Valerie and his inferior position and salary is affecting his self-confidence; Bobby has dropped out of college to become a race car driver but has not revealed this to his parents; Marcia's husband Wally was fired from his job at a toy company; Jan is separating from her husband Philip and Cindy is fighting for her independence since she is the youngest and still gets treated like the baby of the family. Cindy is currently a college undergraduate and in an issue similar to Bobby's, Cindy lies to her parents about overwhelming college student issues, when in actuality she plans to go skiing in Aspen with her roommates.Even their former housekeeper Alice is dealing with a serious issue: her husband Sam has recently left her for another woman. Through each child deciding to spend the holiday and eventually opening up about their issues, Mike and Carol are able to help them out. However, the family's Christmas dinner is disrupted when Mike learns that a ruthless businessman he designed a building for has cut corners, resulting in the building collapsing and trapping two security guards inside. Mike manages to free the trapped employees, but an aftershock results in Mike getting trapped in rubble himself.In the end, Mike gets out of the debris after Carol and the entire family sings "O Come All Ye Faithful" (a nod to Carol singing it in the original series' episode "The Voice of Christmas"). After returning home, the family's dinner is again interrupted, this time by a man at the door dressed as Santa Claus. The kids ask where his bag of presents is, but he tells them that he only has one present, for Alice; it turns out to be Sam, in disguise, who has seen the error of his ways and pleads for Alice's forgiveness. After she takes Sam back, the family invites him to stay for dinner, and the film ends with everyone singing a chorus of "We Wish You a Merry Christmas".
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Question: What song does everyone sing at the end of the film?, Answer: "We Wish You a Merry Christmas"