Reasoning and answer: First find the number of roses needed for one ounce of perfume: 320 petals / 8 petals / rose = 40 roses. Then multiply the number of roses needed for one ounce by the number of ounces per bottle to find the number of roses per bottle: 40 roses / ounce * 12 ounces / bottle = 480 roses / bottle. Then multiply that number by the number of bottles to find the total number of roses needed: 480 roses / bottle * 20 bottles = 9600 roses. Then divide that number by the number of roses per bush to find the number of bushes Fern needs to harvest: 9600 roses / 12 roses / bush = 800 bushes.
The answer: 800
What was the question?
Question: It takes 320 rose petals to make an ounce of perfume. If each rose produces 8 petals, and there are 12 roses per bush, how many bushes will Fern have to harvest to make 20 12-ounce bottles of perfume?


After Lyndee ate, there were 11 - 1 = 10 pieces of chicken left. Lyndee had 10 / 2 = 5 friends over.
The answer: 5
Reverse engineering the question: Mrs. Crocker made 11 pieces of fried chicken for Lyndee and her friends. If Lyndee only ate one piece but each of her friends got to eat 2 pieces, how many friends did Lyndee have over?


Reasoning and answer: He dances 4 * 2 = 8 hours per week. He dances for 52 * 10 = 520 weeks. So in total he danced for 8 * 520 = 4160 hours.
The answer: 4160
What was the question?
Question: Tom dances 4 times a week for 2 hours at a time and does this every year for 10 years. How many hours did he dance?


If the initial price was $600, after negotiating the price, Karsyn paid 20 / 100 * $600 = $120 less. The price at which she bought the phone is $600 - $120 = $480.
The answer: 480
Reverse engineering the question: After negotiating for the price of a phone, Karsyn bought a phone at 20% of the initial price. If the phone's initial price was $600, calculate how much she paid after negotiating.


Reasoning and answer: Tony walks 3 miles at 3 miles per hour for 3 / 3 = 1 hour. Tony also runs 10 miles at 5 miles per hour for 10 / 5 = 2 hours. Thus, each day he exercises for 1 + 2 = 3 hours. Over the course of one week, he exercises for 3 * 7 = 21 hours.
The answer: 21
What was the question?
Question: Tony exercises every morning by walking 3 miles carrying a 25-pound backpack, then he runs another 10 miles without the backpack. If he walks at a speed of 3 miles per hour and runs at a speed of 5 miles per hour, how many hours each week does he spend exercising?


Reasoning and answer: Instead of $5 each, a book costs $5 - $0.5 = $4.5 each. Sheryll paid $4.5 / book x 10 books = $45.
The answer: 45
What was the question?
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.
user
In a bookstore, a book costs $5. When Sheryll bought 10 books, she was given a discount of $0.5 each. How much did Sheryll pay in all?