[Question]Thomas, Toby, and Rebecca worked a total of 157 hours in one week. Thomas worked x hours. Toby worked 10 hours less than twice what Thomas worked, and Rebecca worked 8 hours less than Toby. How many hours did Rebecca work?
[Answer]Toby: 2x - 10. Rebecca: (2x - 10) - 8 = 2x - 18. Total:2x - 10 + 2x - 18 + x = 157. 5x - 28 = 157. 5x = 185. x = 37 hours. Rebecca:2(37) - 18 = 56 hours. The answer is 56.
Q: Mark buys a Magic card for $100, which then triples in value. How much profit would he make selling it?
A: The value went up to 100 * 3 = $300. So he gained 300 - 100 = $200. The answer is 200.
Question: John eats 10 potato chips that have a total of 60 calories. He then eats 6 cheezits that each have 1/3 more calories than a chip. How many total calories did he eat?
Answer: The chips each have 60 / 10 = 6 calories. That means the cheezits have 6 / 3 = 2 calories more than each chip. So they have 6 + 2 = 8 calories each. That means they have 6 * 8 = 48 total calories. So in total, he ate 60 + 48 = 108 calories. The answer is 108.
[Question]Tyler has $100. If he buys 8 scissors for $5 each and 10 erasers for $4 each, how much of his money remains?
[Answer]8 * $5 = $40 is the price of 8 scissors. 10 * $4 = $40 is the price of 10 erasers. You can find the total price by adding the cost of the scissors and erasers: $40 + $40 = $80. $100 - $80 = $20 is the remaining amount of his money. The answer is 20.
Q: A crayon factory makes 4 colors of crayons. They put 2 of each color crayon in each box. The factory produces enough crayons to fill 5 boxes per hour. How many crayons does the factory produce in 4 hours?
A: Each box contains 4 * 2 = 8 crayons. In an hour, they make 8 * 5 = 40 crayons. In 4 hours they make 4 * 40 = 160 crayons. The answer is 160.
Question: James gets 3 parking tickets. The first 2 cost $150 each and the third cost 1/3 as much as one of these. His roommate agrees to pay half the cost. How much money does he have left if he had $500 in the bank?
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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The third ticket cost $150 / 3 = $50. So the tickets cost $150 * 2 + $50 = $350. That means he paid $350 / 2 = $175. So he had $500 - $175 = $325 left over. The answer is 325.