[Question]At 30, Anika is 4/3 the age of Maddie. What would be their average age in 15 years?
[Answer]If Anika is 30 now, in 15 years, she'll be 30 + 15 = 45 years old. At 30, Anika is 4 / 3 the age of Maddie, meaning Maddie is 4 / 3 * 30 = 40 years. In 15 years, Maddie will be 40 + 15 = 55 years old. Their total age in 15 years will be 55 + 45 = 100. Their average age in 15 years will be 100 / 2 = 50. The answer is 50.
Q: Mark realizes that a lot of the friends on his friends list are people he doesn't talk to anymore. He keeps 40% of his friends list and then contacts the rest. Of those only 50% respond. He removes everyone who did not respond. If he had 100 friends how many does he have left after the removal?
A: He contacted 1 - .4 = .6 of his friends. So he contacted 100 * .6 = 60 people. So he removes 60 / 2 = 30 people. So he has 100 - 30 = 70 friends left. The answer is 70.
Question: Tom charges a fee of $100 a day to search for an item for the first 5 days and then $60 per day for every day after that. How much did it cost for him to look for an item for 10 days?
Answer: The first 5 days cost 5 * 100 = $500. He gets 10 - 5 = 5 days on discount. He paid 5 * 60 = $300 at the discounted rate. So in total he pays 500 + 300 = $800. The answer is 800.
[Question]Mark constructs a cube of pure gold. The cube is 6 cm on each side. The density of gold is 19 grams per cubic centimeter. He buys the gold for $60 per gram. He sells it for 1.5 times its gold value. What was the profit?
[Answer]The cube is 6 * 6 * 6 = 216 cubic cm. So it has a mass of 216 * 19 = 4104 grams. So it uses 60 * 4104 = $246240. That means he sells it for 246240 * 1.5 = $369360. So he has a profit of 369360 - 246240 = $123,120. The answer is 123120.
Q: When doing her exercises, Mairead runs for 40 miles, walks for 3/5 times as many miles as she ran, and walks for five times the number of miles she jogged. Calculate the total distance Mairead has covered while doing her exercises.
A: Since the distance that Mairead jogged is 3 / 5 times the miles she ran, she jogged for 3 / 5 * 40 = 24 miles. The total distance that she covered while running and jogging is 24 + 40 = 64. She also walked for 5 * 24 = 120 miles for her exercise. She covered 120 + 64 = 184 miles while doing her exercise. The answer is 184.
Question: Ben works 8-hour shifts in a furniture shop. It takes him 5 hours to build 1 rocking chair. How many chairs can he build in 10 days?
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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He works 8 hours a day for 10 days means he works 8 * 10 = 80 hours. It takes him 5 hours to build one rocking chair so over 80 hours he builds 80 / 5 = 16 rocking chairs. The answer is 16.