Come up with a question and reasoning that would justify this answer: 3400
Question and rationale: The question is: About 450 000 people lived in Maryville in 2000. In 2005, about 467 000 people lived in Maryville. What is the average number of people added each year?
Step-by-step reasoning process: The total increase of people was counted in 2005 - 2000 = 5 years. In 5 years, there is a total of 467 000 - 450 000 = 17 000 people increase. So, each year, the average number of people added is 17 000 / 5 = 3 400.

Come up with a question and reasoning that would justify this answer: 2
Question and rationale: The question is: Melissa bought 4 packs of tennis balls for $24 in total. Each pack contains 3 balls per pack. How much did it cost Melissa for each tennis ball?
Step-by-step reasoning process: There are 4 packs of tennis balls while each pack has 3 balls. 4 * 3 = 12 balls. Melissa spent a total of $24 for a total of 12 balls. $24 / 12 = $2 per ball.

Come up with a question and reasoning that would justify this answer: 22
Question and rationale: The question is: Alice's white water rafting class is composed of 40 students and 10 instructors, including herself. She has 20 life vests on hand. 20% of her students are bringing life vests. How many more life vests will Alice need to get so that entire class has one?
Step-by-step reasoning process: 20% of her 40 students will bring their own life vest so .20 * 40 = 8 students will bring their life vests. Alice has 20 life vests and 8 students will bring there's so that's 20 + 8 = 28 life vests. There are 40 students and 10 instructors total so that's 40 + 10 = 50 people in the class. If there are 28 life vests and she has 50 people then she needs to find 50 - 28 = 22 more life vests.

Come up with a question and reasoning that would justify this answer: 70
Question and rationale:
The question is: A library has a collection of 100 historical novels arranged on a shelf. 5 people borrow 2 books each from the shelf on a particular day, and 20 more books are borrowed from the shelf on the second day. How many books are remaining on the shelf after the second day?
Step-by-step reasoning process: Five people borrowed 5 people * 2 books / person = 10 books on the first day. After the second day, the total number of borrowed books increased to 10 books + 20 books = 30 books. The total number of books on the shelf after the second day is 100 books - 30 books = 70 books.