Question: At a school, 40% of the students receive a free lunch. These lunches are paid for by making sure the price paid by the paying students is enough to cover everyone's meal. If it costs $210 to feed 50 students, how much do the paying students pay for lunch?
Answer: 60% of the students pay for the lunch because 100 - 40 = 60. 30 students pay for lunch because 50 x .6 = 30. These students pay $7 for their lunch because 210 / 30 = 7. The answer is 7.
[Question]40% of a farmer's cattle are males. The rest are females. If a female cow produces 2 gallons of milk a day, how much milk will the farmer get a day if he has 50 male cows?
[Answer]The farmer has 125 cows because 50 / .4 = 125. The farmer has 75 female cows because 125 x .6 = 75. The farmer will get 150 gallons of milk a day because 75 x 2 = 150. The answer is 150.
Q: An auctioneer raises the price of an item he is auctioning by $5 every time someone new bids on it. Two people enter a bidding war on a desk and the price goes from $15 to $65 before the desk is sold. How many times did each person bid on the desk?
A: The desk price was raised 65 - 15 = $50. At $5 per bid, there were 50 / 5 = 10 bids on the desk. There were two bidders, so each bid 10 / 2 = 5 times on the desk. The answer is 5.
Question: A wood stove burns 4 bundles of wood in the morning, then some more in the afternoon. If there were 10 bundles of wood at the start of the day and 3 bundles of wood at the end of the day, how many bundles of wood were burned in the afternoon?
Answer: Working out the difference between the amount of wood available at the start and the end of the day shows that 10 bundles – 3 bundles = 7 bundles of wood have been burned throughout the day. Subtracting the wood burned in the morning from this shows that 7 bundles – 4 bundles = 3 bundles of wood were burned in the afternoon. The answer is 3.
[Question]Mr. and Mrs. McPherson have to renew their rent by the end of the year. They agreed that Mrs. McPherson would raise 30% of the money. If their rent is $1200 per year, how much does Mr. McPherson need to raise to complete the rent?
[Answer]30% of $1200 is (30 / 100) * $1200 = $360. Mrs. McPherson will pay $360 leaving $1200 - $360 = $840 which Mr. McPherson will have to raise. The answer is 840.
[Question]Jenna's doctor tells her that she should tan no more than 200 minutes a month. If she tans 30 minutes a day, two days a week for the first two weeks of the month, how many minutes can she tan in the last two weeks of the month?
[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.
user
First find how many minutes Jenna tans each of the first two weeks: 30 minutes / day * 2 days / week = 60 minutes / week. Then multiply that number by the number of weeks to find how many minutes Jenna tans in the first half of the month: 60 minutes / week * 2 weeks = 120 minutes. Then subtract that time from the total time Jenna can spend tanning to find how many more minutes she can tan: 200 minutes - 120 minutes = 80 minutes. The answer is 80.