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How many feet of piping can be made from 5 cubic feet of iron
if the outer and inner diameters of the pipe are 8 and 6 inches, respectively?
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The solution by @josgarithmetic is INCORRECT, as usual.
I came to bring a correct solution.
Outer diameter is 8 inches = ft; inner diameter is 6 inches = ft.
Outer radius is ft; inner radius is ft.
The cross-section area is A = - = = = square feet.
For the pipe length L we have this equation
A*L = 5 cubic feet, or = 5.
From this equation
L = = = 32.74 ft (rounded).
ANSWER. The pipe length is about 32.74 ft.
Solved.
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Formula in the post by @josgarithmetic is INCORRECT - - - even do not try to use it.
For your safety, you better ignore his post.
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He re-wrote everything from me after seeing my post.