[Question]The sum of the three numbers is 500. If the first number is 200, and the value of the second number is twice the value of the third number, find the value of the third number.
[Answer]Let's say the third number is x. The sum of the second and third number is 500 - 200 = 300. Since the third number is x, the sum of the values of the second and third number is x + 2x = 300. This is 3x = 300. The value of the third number is x = 300 / 3. x = 100. The answer is 100.

[Question]Henry needs to declutter his book collection of 99 books. From his bookshelf, he was able to fill 3 boxes of 15 books each to take to a donation center. He had 21 books in a room he could donate, 4 on his coffee table and 18 cookbooks stashed in the kitchen. When he dropped them off, he noticed a box of books that had a "free to a good home" note. He grabbed 12 books to take back to his place. How many books does Henry now have?
[Answer]He filled 3 boxes with 15 books each so 3 * 15 = 45 books. From the rest of his house he is donating 45 + 21 + 4 + 18 = 88 books for donation. His collection is 99 books and he is donating 88 books, so that leaves him with 99 - 88 = 11 books. He picks up 12 books to add to his collection of 11 books so he now has 12 + 11 = 23 books. The answer is 23.

[Question]Amber and Josh are flying to France for vacation. Their flight leaves at 8:00 pm and as an international flight, it's recommended that they check in 2 hours early. It will take 45 minutes to drive to the airport and another 15 minutes to park their vehicle and make their way to the terminal. What is the latest time they can leave their house to make it to the airport in time?
[Answer]It will take 45 minutes to drive to the airport and 15 minutes to park so that's 45 + 15 = 60 minutes (1 hour). They need to check in 2 hours early and it will 1 hour to drive there and park so that's 2 + 1 = 3 hours. Their flight leaves at 8:00 pm and it will take 3 hours to drive there and check in so the latest they can leave is 8 - 3 = 5:00 pm. The answer is 5.

[Question]Lanie has been sick and was only able to work 4/5 of her usual 40-hour week. If her hourly rate is $15, how much was her salary for that week?
[Answer]

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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Lanie was only able to work for 40 * 4 / 5 = 32 hours in that week. Thus, her salary was 15 * 32 = $480. The answer is 480.