[Question]A pen costs $9 more than a pencil. If a pencil costs $2, find the total cost of both items.
[Answer]A pen costs $9 more than $2 which is $9 + $2 = $11. Altogether they cost $11 + $2 = $13. The answer is 13.
Q: James buys 20 coins of a cryptocurrency at $15 each. The value of the coins increases by 2/3. He sells coins to recoup his original investment. How many coins did he sell?
A: His original investment was 15 * 20 = $300. The value of his investment increases by 15 * 2 / 3 = $10 per coin. So each coin was worth 15 + 10 = $25. So he sold 300 / 25 = 12 coins. The answer is 12.
Question: Miles and Daphne are comparing their reading collection and want to figure out who has more pages. They are about to count each page, but their parents suggest that they see whose collection is taller. Mile's collection is taller, but then Daphne notices that Miles reads board books, and so the pages are thicker. After some more measuring, they figure out that for Miles, 1 inch equals 5 pages, but for Daphne 1 inch equals 50 pages. If Miles's books are 240 inches tall and Daphne's collection is 25 inches tall, how many pages are in the longest collection?
Answer: Miles's collection has 1,200 pages because 240 x 5 = 1,200. Daphne's collection has 1,250 pages because 25 x 50 = 1,250. The largest collection has 1,250 pages because 1,250 > 1,200. The answer is 1250.
[Question]The movie theater sold 18 more than three times the number of tickets to the horror movie as it did to the romance movie. If the theater sold 25 tickets to the romance movie, how many tickets did it sell to the horror movie?
[Answer]Three times the number of tickets to the romance movie is 25 * 3 = 75 tickets. The horror movie sold 75 + 18 = 93 tickets. The answer is 93.
Q: 48 children are trying to share a pack of sweets. After taking 4 sweets each, there is still a third of the original amount left. What is the original number of sweets in the pack?
A: 48 children took 4 each for a total of 48 * 4 = 192 sweets. If there is 1 / 3 left then 192 is 1 - (1 / 3) = 2 / 3 of the original amount (The whole packet minus 1 third). Therefore 192 is 2 / 3 of the original amount: (2 / 3) * original amount = 192. Multiplying both sides of the equation by (3 / 2) gives: original amount = 192 * (3 / 2) = 288. The answer is 288.
Question: A pen and pencil have a total cost of $6. If the pen costs twice as much as the pencil, what is the cost of the pen?
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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Let x be the cost of the pencil. If the pen costs 2 times the cost of the pencil, then it costs 2x. Adding the cost of the pen and pencil we get 2x + x = 3x. Since the total cost is $6 then 3x = $6 therefore x = $6 / 3 = $2. One pen is equal to 2 * x which is 2 * $2 = $4. The answer is 4.