In the afternoon there are 2355 - 629 = 1726 loaves of bread left. By the evening there is a delivery and there are now 1726 + 489 = 2215 loaves of bread.
The answer: 2215
Reverse engineering the question: A supermarket has 2355 loaves of bread at the start of the day. By afternoon, 629 loaves are sold, and a further 489 loaves are delivered to the supermarket by their supplier in the evening. How many loaves of bread are there at the end of the day?


Reasoning and answer: Instead of $12 each, an Uno Giant Family Card costs $12 - $2 = $10 each. Ivan paid $10 x 10 = $100 for the ten pieces Uno Giant Family Card.
The answer: 100
What was the question?
Question: In a store, an Uno Giant Family Card costs $12. When Ivan bought ten pieces, he was given a discount of $2 each. How much did Ivan pay in all?


The total ratio of goats and sheep on the farm is 5 + 7 = 12. The fraction that represents goats from the total ratio is 5 / 12, and since there are 360 goats and sheep on the farm, the number of goats is 5 / 12 * 360 = 150. The number of sheep on Mr. Mathews's farm is 360 - 150 = 210. Mr. Mathews sold 1 / 2 * 150 = 75 goats. If each goat went for $40, the total amount of money Mr. Mathews made from the sale of his goats is 75 * $40 = $3000. He also sold 2 / 3 * 210 = 140 of the total sheep on his farm. The income from the sale of the sheep is 140 * $30 = $4200. From the sale of goats and sheep, Mr. Mathews made $4200 + $3000 = $8600.
The answer: 7200
Reverse engineering the question: On his farm, Mr. Mathews has goats and sheep in the ratio of 5:7. He decides to sell half of the goats at $40 each and 2/3 of the sheep at $30 each. How much money does he make from the sale of the animals if the total number of sheep and goats on the farm is 360?


Reasoning and answer: He needs 18 valentine's cards because 30 x .6 = 18. He will spend $36 on these because 18 x 2 = 36. The proportion of his income spent is .9 because 36 / 40 = .9. This is 90% of his income because .9 x 100 = 90.
The answer: 90
What was the question?
Question: Mo is buying valentine's day cards for the class. There are 30 students and he wants to give a Valentine to 60% of them. They cost $2 each. If he has $40, what percentage of his money will he spend on Valentine?


In Dana's senior class, the 60% of 200 students is 0.6 * 200 = 120 female students. Fifty percent of the females, or 0.5 * 120 = 60 of the female students were brunettes. If 50% of the female brunettes were under 5 feet tall, then there were 60 * 0.5 = 30 female brunettes under five feet tall in Dana's senior class.
The answer: 30
Reverse engineering the question: In Dana's senior high school class there were 200 students. 60% of the students were female, and 50% of the females were brunettes. If 50% of the female brunettes were under 5 feet tall, then how many female brunettes in Dana's high school senior class were under 5 feet tall?


Last year, there were a total of 100 + 50 = 150 books in the library. The library purchased 50 x 3 = 150 books this year. Therefore, the library now has a total of 150 + 150 = 300 books.
The answer: 300
Reverse engineering the question:

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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Last year, the school library purchased 50 new books. This year, it purchased 3 times as many books. If the library had 100 books before it purchased new books last year, how many books are in the library now?