[Question]The teacher decided to rewards his students with extra recess on report card day if they got good grades. Students normally get 20 minutes for recess. He told the students that every A got them 2 extra minutes of recess. Every B got them one extra minute. Every C got them zero extra minutes, but every D got them 1 less minute. When report cards came out there were 10 As, 12 Bs, 14Cs, and 5Ds. In total, how much recess would the students get that day?
[Answer]The students have 20 minutes to start. They get 20 minutes added for the As because 10 times 2 equals 20. They get 12 minutes added for the Bs because 12 times 1 equals 12. They get no minutes added or subtracted for the Cs because 14 times 0 equals 0. They get 5 minutes taken away for the Ds because 5 times 1 equals 5. In total, they get 47 minutes of recess because 20 plus 20 plus 12 minus 5 equals 47. The answer is 47.

[Question]Oliver has two bags of vegetables. Each bag weighs 1/6 as much as James’s bag, which weighs 18kg. What is the combined weight of both Oliver’s bags?
[Answer]Each of Oliver’s bags weighs 18 kg * 1 / 6 = 3 kg. Combined, both his bags weigh 3 kg * 2 = 6 kg. The answer is 6.

[Question]A farmer is growing corn. For every 4 seeds he plants, he gets one ear of corn, that he can sell for $.1. It costs $.5 for a bag with 100 seeds. If he makes $40 in profit, how many ears did he sell?
[Answer]A single seed costs $.005 because .5 / 100 = .005. It costs $.02 cents to grow an ear of corn because .005 x 4 = .02. On each ear of corn he makes $.098 profit because .1 - .02 = .08. He sold 500 ears because 40 / .08 = 500. The answer is 500.

[Question]James decides to build a tin house by collecting 500 tins in a week. On the first day, he collects 50 tins. On the second day, he manages to collect 3 times that number. On the third day, he collects 50 tins fewer than the number he collected on the second day. If he collects an equal number of tins on the remaining days of the week, what's the number of tins he collected each day for the rest of the 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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On the second day, he collected 3 times the number of tins he collected on the first day, which is 3 * 50 = 150 tins. On the third day, he collected 50 tins fewer than the second day, which is 150 - 50 = 100 tins. The total for the three days is 150 + 100 + 50 = 300 tins. To reach his goal, he still needs 500 - 300 = 200 tins. Since the total number of days left in the week is 4, he'll need to collect 200 / 4 = 50 tins per day to reach his goal. The answer is 50.