[Question]Tony decided to rent a small cottage. The master bedroom and bath totaled 500 sq ft. The 2 guest bedrooms were 200 sq ft each. And the kitchen, guest bath and living area totaled 600 sq ft. If Tony spends $3,000 a month on rent, how much money is he spending per sq ft of house?
[Answer]2 guest bedrooms are 200 sq ft each for a total of 2 * 200 = 400 sq ft. The master suite has 500 sq ft, the guest rooms have 400 sq ft and the rest of the house is 600 sq ft for a total of 500 + 400 + 600 = 1,500 sq ft. The rent is $3,000 for 1,500 sq ft of house so 3000 / 1500 = $2 per sq ft of house. The answer is 2.

[Question]Agnes is 25 years old and her daughter, Jane is 6 years old. In how many years will Agnes be twice as old as Jane?
[Answer]Let the number of years after which Agnes will be twice as old as Jane be x. After x years, 25 + x = 2(6 + x). Solving the equation by expanding and collecting like terms gives: x - 2x = 12 - 25. Further solving gives: - x =  - 13. Multiplying both sides by - 1 gives x = 13. The answer is 13.

[Question]Sabina is starting her first year of college that costs $30,000. She has saved $10,000 for her first year. She was awarded a grant that will cover 40% of the remainder of her tuition. How much will Sabina need to apply for to receive a loan that will cover her tuition?
[Answer]The remainder of Sabina’s tuition bill comes to $30,000 - $10,000 = $20,000. The grant will cover $20,000 * 0.40 = $8,000 of her tuition. That means that Sabina will need to apply for a loan of $20,000 - $8,000 = $12,000 to pay for the rest of her tuition. The answer is 12000.

[Question]Carolyn buys a silverware set with 6 knives, 12 forks, and three times as many spoons as knives. Then her friend trades her 10 knives for 6 spoons. What percentage of Carolyn's silverware is knives?
[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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First find the final number of knives Carolyn has: 10 knives + 6 knives = 16 knives. Then find the initial number of spoons Carolyn has: 6 knives * 3 spoons / knife = 18 spoons. Then find the final number of spoons Carolyn has: 18 spoons - 6 spoons = 12 spoons. Then find the total final amount of silverware Carolyn has: 12 spoons + 16 knives + 12 forks = 40 pieces. Then divide the number of knives by the total number of pieces and multiply by 100% to express the answer as a percentage: 16 knives / 40 pieces * 100% = 40%. The answer is 40.