[Question]Mitch has saved $20000 to finance his boating hobby. A new boat costs $1500 per foot in length. If Mitch needs to keep $500 for a license and registration, and three times that amount for docking fees, how many feet is the longest boat he can buy?
[Answer]Mitch needs to keep 500 * 3 = 1500 for docking fees. Thus, he needs to keep 500 + 3 * 500 = $2000 for license, registration, and docking fees. He has 20000 - 2000 = $18000 left to spend on a boat. Therefore, the longest boat he can buy is 18000 / 1500 = 12 feet long. The answer is 12.
Q: The cost of transporting 80 bags of cement, each weighing 50 kgs, is $6000. What's the cost of transporting three times as many cement bags, each weighing 3/5 times as many kgs?
A: Three times as many cement bags is 3 * 80 = 240 cement bags. If a bag of cement weighs 50 kg, 3 / 5 times as much weight is 3 / 5 * 50 = 30 kgs. If the cost of transporting 80 bags of cement, each weighing 50 kgs, is $6000, the cost of transporting one bag of cement weighing 50 kg is $6000 / 80 = $75. Since a bag weighing 50 kgs costs $75 to transport, a bag weighing 30 kgs will cost 30 * $75 / 50 = $45 to transport. The cost of transporting 240 cement bags each weighing 30 kgs is $45 * 240 = $10800. The answer is 10800.
Question: Rhea buys 2 trays of eggs every week for her family. Her son and daughter eat 2 eggs every morning, and Rhea and her husband eat 4 eggs every night. If each tray has 24 eggs, how many eggs are not being eaten every week?
Answer: Rhea buys a total of 24 x 2 = 48 eggs every week. Her son and daughter eat 2 x 7 = 14 eggs every week. Rhea and her husband eat 4 x 7 = 28 eggs every week. So, the total eggs they eat is 28 + 14 = 42. Therefore, the total number of eggs that are not being eaten is 48 - 42 = 6. The answer is 6.
[Question]Tony has $87. He needs to buy some cheese, which costs $7 a pound and a pound of beef that costs $5 a pound. After buying the beef and his cheese, he has $61 left. How many pounds of cheese did he buy?
[Answer]He spent $26 because 87 - 61 = 26. He spend $21 on cheese because 26 - 5 = 21. He bought 3 pounds of cheese because 21 / 7 = 3. The answer is 3.
Q: Wyatt has 10 blue envelopes. He has 4 fewer yellow envelopes than blue envelopes. How many envelopes does Wyatt have in all?
A: Wyatt has 10 - 4 = 6 yellow envelopes. The total number of envelopes he has is 10 blue + 6 yellow = 16 envelopes. The answer is 16.
Question: Lyanna set up a food bank to collect food to give to the homeless in her local town. In the first week, 40 pounds of food were donated to the food bank by the people of her local town. In the second week, donations were twice as high as the first week. If she gave out 70% of the donated food to the homeless in the third week, calculate the amount of food remaining in the food bank.
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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If 40 pounds of food was donated to the food bank in the first week, the second week, which had twice the amount of food donated as the first week, had 2 * 40 = 80 pounds of food. The total amount of food donated to the food bank after the second week is 40 + 80 = 120 pounds. In the third week, she gave to the homeless 70 / 100 * 120 = 84 pounds of food. The total amount of food remaining in the food bank after she gave out 70% to the homeless is 120 - 84 = 36 pounds of food. The answer is 36.