Step-by-step reasoning process: Let's say the river's length in the straight part of the river is x. The total length of the river is the length of the straight part plus 3 times the length of the straight part for the crooked part, which is x + 3x = 80. The total length of the river is 4x = 80. The straight part of the river is x = 80 / 4 = 20 miles.
The question and answer:
Question and answer: The length of the straight part of a river is three times shorter than the crooked part. If the river is 80 miles long, how long is the straight part of the river?
The answer is 20

Step-by-step reasoning process: Andrew has 6 * 3 = 18 shirts. So, Steven has 4 * 18 = 72 shirts.
The question and answer:
Question and answer: Steven has 4 times as many shirts as Andrew. Andrew has 6 times as many shirts as Brian. If Brian has 3 shirts, how many does Steven have?
The answer is 72

Step-by-step reasoning process: 3 feet are in 1 yard and her fence is 25 yards long so her fence is 3 * 25 = 75 feet long. At maturity these trees will measure 1.5 feet and she needs them to run along her 75 - foot fence so she needs 75 / 1.5 = 50 trees. The trees cost $8.00 apiece and she needs 50 so 8 * 50 = $400.00 worth of trees.
The question and answer:
Question and answer:
Holly wants to plant a wall of privacy trees along her fence line. Her fence is 25 yards long. At maturity, the trees she wants to plant will measure 1.5 feet wide. Right now, these trees are on sale for $8.00 apiece. How much will it cost her to plant a row of the trees to run the length of her fence?
The answer is 400