The total number of miles for a round trip is 280 x 2 = 560. Therefore, he needs to refill his motorcycle 560 / 40 = 14 times.
The answer: 14
Reverse engineering the question: Keanu's motorcycle can store 8 liters of gasoline. If his destination is 280 miles away and his motorcycle consumes 8 liters of gasoline per 40 miles, how many times does Keanu have to refill his motorcycle with gasoline if he will make a round trip?


Reasoning and answer: The shirts she bought cost her $20 because 2 x 10 = 20. She earned $50 selling her clothes because 20 + 30 = 50. She made $15 off pants because 3 x 5 = 15. She made 15 dollars from shorts because 3 x 5 = 15. She made $20 off shirts because 50 - 15 - 15 = 20. She sold 5 shirts because 20 / 4 = 5.
The answer: 5
What was the question?
Question: Selina is selling some of her old clothes to a second-hand store. They will buy her pants for $5 each, her shorts for $3 each, and her shirts for $4 each. She sells 3 pairs of pants, 5 pairs of shorts, and some shirts. After she gets her money, she sees 2 shirts that she likes which cost $10 each and buys them. She leaves the store with $30. How many shirts did she sell to the store?


She had 8 records, received 12 and bought 30 for a total of 8 + 12 + 30 = 50 records. It takes 2 days to listen to 1 record and she has 50 records it will take her 2 * 50 = 100 days.
The answer: 100
Reverse engineering the question: Roberta started off with 8 vinyl records. Her friends gave her 12 records for her birthday and she bought 30 more at a garage sale. It takes her 2 days to listen to 1 record. How many days will it take her to listen to her record collection?


Reasoning and answer: Pauline planted in total 3 * 5 = 15 tomatoes. Pauline also planted 5 * 4 = 20 cucumbers. In total Pauline planted 15 + 20 + 30 = 65 different vegetables. The whole garden can be filled up with 10 * 15 = 150 different vegetables. So Pauline could plant 150 - 65 = 85 more vegetables in her garden.
The answer: 85
What was the question?
Question: Pauline has a garden with vegetables. In it, Pauline has planted 3 kinds of tomatoes - 5 of each kind, 5 kinds of cucumbers - 4 of each kind, and 30 potatoes. In the whole garden, there are 10 rows with 15 spaces in each to plant any vegetable. How many more vegetables could Pauline plant in her garden?


In the second month, Vinny lost half as much as he had the first month, so he lost 20 pounds / 2 = 10 pounds. In the third month, he again lost half as much which was 10 pounds / 2 = 5 pounds. And in the fourth month, he lost 5 pounds / 2 = 2.5 pounds. So in total, Vinny lost 20 + 10 + 5 + 2.5 = 37.5 pounds in the first four months. Over his entire diet, he had lost 300 – 250.5 = 49.5 pounds. So in the fifth month, Vinny must have lost 49.5 pounds total loss – 37.5 pounds loss in the first four months = 12 pounds.
The answer: 12
Reverse engineering the question: Vinny weighed 300 pounds then lost 20 pounds in the first month of his diet. He continued his diet but each month, he lost half as much weight as he had lost in the previous month. At the start of the fifth month of his diet, he worked harder to lose extra weight then decided to end his diet. If Vinny weighed 250.5 pounds at the end of his diet, how many pounds did he lose throughout the fifth month?


Lilia earned 10 x $2 = $20 for selling the peaches to her friends. She also earned 4 x $1.25 = $5 for selling the peaches to her relatives. Therefore, Lilia earned $20 + $5 = $25 for selling 14 peaches.
The answer: 25
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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Lilia has 15 peaches. She sold 10 peaches to her friends for $2 each, while 4 other peaches were sold to her relatives for $1.25 each, and she left the other one for herself. How much did she earn after selling 14 peaches?