Answer the following question.
Silvio was running a race that had 4 parts. The total length of the race was 74.5 kilometers. The first part of the race is 15.5 kilometers long. The second and third parts are each 21.5 kilometers long. How many kilometers is the last part of the race?
Step-by-step reasoning process: 15.5 + (2 * 21.5) = 58.5 km. 74.5 - 58.5 = 16 kilometers. The last part of the race is 16 kilometers.
The answer is 16.

Answer the following question.
Peggy fell off her bike and skinned her knees. She needed two bandages on her left knee and three bandages on her right knee. If the box of bandages had 8 less than two dozen bandages before Peggy skinned her knees, how many bandages were left in the box after Peggy finished putting bandages on her knees?
Step-by-step reasoning process: Two dozen is 12 * 2 = 24. Eight less than two dozen bandages is 24 - 8 = 16 bandages. She needed two bandages on her left knee and three bandages on her right knee for a total of 2 + 3 = 5 bandages. Therefore, after Peggy finished putting bandages on her knees there were 16 - 5 = 11 bandages remaining in the box.
The answer is 11.

Answer the following question.
Rodney, Roger and Ron can lift a combined weight of 239 pounds. Rodney can lift twice as much as Roger, and Roger can lift 7 pounds less than 4 times the amount that Ron can lift. How much can Rodney lift?
Step-by-step reasoning process: Let x represent the amount that Ron can lift. Roger: 4x - 7. Rodney:2(4x - 7) = 8x - 14. Total:x + 4x - 7 + 8x - 14 = 239. 13x - 21 = 239. 13x = 260. x = 20. Rodney:8(20) - 14 = 146 pounds.
The answer is 146.

Answer the following question.
A river is to be used for a boat race. If each boat is 3 feet across and they must have at least 2 feet between them or the riverbank, how many boats can race in a river that is 42 feet across?

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: Each boat will require 3 feet across to fit itself and 2 feet space on one side for a total of 2 + 3 = 5 feet per boat. The last boat will need an additional 2 feet space on its other side, so this 2 feet should be subtracted first from the 42 feet which leaves 42 - 2 = 40 feet. 5 feet per boat on the remaining 40 feet for a total of 40 / 5 = 8 boats.
The answer is 8.