Come up with a question and reasoning that would justify this answer: 41
Question and rationale: The question is: A book library charges fifty cents per day on any book borrowed by its members to read outside the library's premises. At the start of May, Celine borrowed three books from the library to read at home for her upcoming examinations. If she returned one book 20 days after borrowing it, and the other two stayed at her house until the end of May, calculate the total amount of money that she paid at the library for lending the three books.
Step-by-step reasoning process: Celine was charged $0.50 * 20 = $10 for the book she returned to the library after 20 days. If the other two books stayed at her house until the end of May, she paid 31 * $0.50 = $15.5 for each book. For the two books that stayed at her house until the end of May, Celine paid $15.5 * 2 = $31. For the three books, Celine paid $31 + 10 = $41.

Come up with a question and reasoning that would justify this answer: 120
Question and rationale: The question is: Mike is feeding the birds at the park. He counts out the seeds as he throws them. He throws 20 seeds to the birds on the left. He throws twice as much to the bigger group of birds on the right. Some more birds flutter over to join the others for lunch and Mike throws 30 more seeds for them. If Mike has 30 seeds left to feed the last of the birds, how many seeds did Mike start with?
Step-by-step reasoning process: Mike started by throwing 20 seeds to the birds and then threw twice as many, 20 + 20(2) = 20 + 40. That totals to 20 + 40 = 60 seeds. He also threw 30 other seeds and had 30 left over, which means he started with 60 + 30 + 30 = 120 seeds.

Come up with a question and reasoning that would justify this answer: 10
Question and rationale: The question is: The price per organic egg is 50 cents. The price of a tray of eggs that contains 30 eggs is $12. How much can you save, in cents, per egg if you buy a tray versus individual eggs?
Step-by-step reasoning process: The price per egg in a tray is $12 / 30 eggs = $0.4 / egg. The equivalent of $0.4 in cents is $0.4 x 100 cents / dollar = 40 cents. Hence, you can save 50 cents - 40 cents = 10 cents per egg if you buy a tray.

Come up with a question and reasoning that would justify this answer: 355
Question and rationale:

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.
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The question is: There are 1250 pairs of shoes in the warehouse. There are 540 pairs that are blue. The rest are either green or purple. The number of green shoes is equal to the number of purple shoes. How many pairs of purple shoes are in the warehouse?
Step-by-step reasoning process: 1250 - 540 = 710. 710 / 2 = 355. There are 355 pairs of purple shoes in the warehouse.