Civil Engineers use the formula shown to determine the stress or load a hollow column made of cast iron can handle.
Yr+60AL=12000A.

where I" is the allowable load, in pounds (Ib). A is the section area of the column, in square inches (in²) , L is the langth of the colum, to taches (im.), and r is the smallest value in inches (in.), of the radius of any movement allowed by the columm. Which formula is equivalent to the given formula?
A. L=200AYr
B. Y= (12000A-60AL)/r
C. Y=r(12000-60AL)
D. L=12000A-Yr-60A

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