Answer the following question.
Michael has two brothers. His oldest brother is 1 year older than twice Michael's age when Michael was a year younger. His younger brother is 5 years old, which is a third of the age of the older brother. What is their combined age?
Step-by-step reasoning process: The oldest brother is 15 because 3 x 5 = 15. Michael is 8 because if 1 + (Michael's age - 1) x 2 = 15 then Michael's age = 8. Their combined age is 28 because 5 + 15 + 8 = 28.
The answer is 28.

Answer the following question.
Mrs. Smith wanted to buy wears worth $500. She went to a boutique with the $500 but by the time she had picked out everything she liked, she realized that she would need two-fifths more money than she had. If the shop owner gave her a discount of 15%, how much more money will she still need?
Step-by-step reasoning process: Two fifths of $500 is (2 / 5) * $500 = $200. She needed $200 more than $500 which is $200 + $500 = $700. 15% of $700 is (15 / 100) * $700 = $105. She was given a $105 discount so she has to pay $700 - $105 = $595. She would still need $595 - $500 = $95.
The answer is 95.

Answer the following question.
A library has a number of books. 35% of them are intended for children and 104 of them are for adults. How many books are in the library?
Step-by-step reasoning process: 65% of the library books are for adults because 100 - 35 = 65. There are 160 library books in total because 104 / .65 = 160.
The answer is 160.

Answer the following question.
Suzie and 5 of her friends decide to rent an Airbnb at Lake Tahoe for 4 days from Thursday to Sunday. The rental rate for weekdays is $420 per day. The weekend rental rate is $540 per day. They all decide to split the rental evenly. How much does each person have to pay?

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 cost of the rental for Thursday and Friday comes to $420 * 2 = $840. The cost of the rental for Saturday and Sunday comes to $540 * 2 = $1080. The total cost of the rental comes to $840 + 1080 = $1920. The payment required for each person comes to $1920 / 6 = $320.
The answer is 320.