[Question]A farmer is checking his fields to make sure all of his crops are growing as they should. Rows of corn stalks should produce 9 corn cobs each, and rows of potatoes should produce 30 potatoes each. As he’s checking crop quality, he notices that there are more pests than usual and they have destroyed some of his crops. He thinks that half of his crops have been destroyed by the pests. If the farmer has 10 rows of corn stalks and 5 rows of potatoes, how many crops does the farmer still have?
[Answer]The farmer had a total of 10 rows of corn stalks * 9 corn cobs each = 90 corn cobs. He also had a total of 5 rows of potatoes * 30 potatoes each = 150 potatoes. This was a total of 90 corn cobs + 150 potatoes = 240 crops. Because pests destroyed half of his crops, he now has 240 crops * 0.5 = 120 crops. The answer is 120.
Q: Hillary's teacher assigned 1 hour of reading during the weekend. On Friday night, Hillary read for 16 minutes. On Saturday she read for 28 minutes. How many minutes does Hillary have to read on Sunday to complete the assignment?
A: Hillary needs to read for 1 hour which equals 60 minutes. Hillary has read for a total of 16 minutes + 28 = 44 minutes so far. Hillary will need to read for 60 minutes - 44 = 16 minutes on Sunday. The answer is 16.
Question: At Sarah's job 60% of the employees are women and the rest are men. Of the men, 75% have a college degree and 8 do not. How many women work at Sarah's company?
Answer: 25% of men at the job don't have a college degree because 100 - 75 = 25. There are 32 men at the company because 8 / .25 = 32. 40% of the employees are men because 100 - 60 = 40. The company has 80 workers because 32 / .4 = 80. There are 48 women at the company because 80 - 32 = 48. The answer is 48.
[Question]Bill and Joan both work for a library. 5 years ago, Joan had 3 times as much experience as Bill. Now she has twice as much experience as Bill. How many years of experience does Bill have now?
[Answer]Let b be Bill's years of experience and j be Joan's years of experience. We know that j - 5 = 3(b - 5) and j = 2b. Substituting the second equation into the first equation, we get 2b - 5 = 3(b - 5). Multiplying through the parentheses, we get 2b - 5 = 3b - 15. Adding 15 to both sides, we get 2b + 10 = 3b. Subtracting 2b from both sides, we get 10 = b. The answer is 10.
Q: Johnny is buying planks of wood to build some tables. Each table needs a plank of wood for each of the legs and 5 planks of wood for the surface. If Johnny wants to build 5 tables, how many planks of wood does he need?
A: Each table needs 1 plank of wood * 4 legs = 4 planks of wood for the legs. This means each table needs 4 planks of wood for legs + 5 planks of wood for the surface = 9 planks of wood. To build 5 tables, Johnny will therefore need 9 planks of wood * 5 tables = 45 planks of wood. The answer is 45.
Question: Mark does a gig every other day for 2 weeks. For each gig, he plays 3 songs. 2 of the songs are 5 minutes long and the last song is twice that long. How many minutes did he play?
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
He played 7 * 2 = 14 gigs. The long song was 5 * 2 = 10 minutes. So all the gigs were 5 + 5 + 10 = 20 minutes. So he played 14 * 20 = 140 minutes. The answer is 280.