Question: Erin put 16 curlers in her hair. One-fourth of the curlers are small pink ones. There are twice as many medium blue curlers as there are pink ones. The rest are large green curlers. How many large green curlers does Erin have in her hair?
Answer: Step-by-step reasoning process: There are 16 curlers in all and ¼ of them are pink or 16 curlers / 4 = 4 pink curlers. There are twice as many blue curlers as there are pink ones, so there are 4 pink x 2 = 8 blue curlers. Together, there are 4 pink curlers + 8 blue curlers = 12 pink and blue curlers in Erin’s hair. The remaining curlers are green, so of the 16 total curlers – 12 pink and blue curlers = 4 green curlers are in Erin’s hair.
So the answer is 4.

Question: James decides to go to prom with Susan. He pays for everything. The tickets cost $100 each. Dinner is $120. He leaves a 30% tip. He also charters a limo for 6 hours that cost $80 per hour. How much did it all cost?
Answer: Step-by-step reasoning process: He paid 100 * 2 = $200 for tickets. The tip for dinner was $120 * .3 = $36. So he paid $120 + $36 = $156 for dinner. The limo cost $80 * 6 = $480. In total he paid $200 + $156 + $480 = $836.
So the answer is 836.

Question: Kim spends $25,000 to open a store. She makes $4000 a month in revenue and her expenses are $1500 a month. How long would it take to pay back the cost to open the store?
Answer: Step-by-step reasoning process: Her profit is 4000 - 1500 = $2500. So it takes 25000 / 2500 = 10 months to make back the money.
So the answer is 10.

Question: Tracy has a charity book collection store from which she receives book donations from members of her town. Any person who wants to borrow a book is free to do so as long as they return the book after they've finished reading. She has already received 300 book donations. If ten people come and donate five books each in a week, and a total of 140 books are borrowed by other people to read, calculate the total number of books she has remaining in the store?
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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Step-by-step reasoning process: The ten people donated 10 * 5 = 50 books. The total number of books in her store after the new donations is 300 + 50 = 350 books. When some of the books are borrowed, her total collection becomes 350 - 140 = 210 books.
So the answer is 210.