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Translation equation.

A rectangle's width is one-third its length, and is perimeter is 56 feet. Find the dimensions of the rectangle. Write a mathematical translation of the situation and then saw for the dimensions

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Edward C. | Caltech Grad for math tutoring: Algebra through CalculusCaltech Grad for math tutoring: Algebra ...
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Let W = width, L = length.  
 
We are given that W = L/3, so 3W = L.  
 
The perimeter is 56 = W + L + W + L.  
 
Substituting 3W for L gives W + 3W + W + 3W = 56  ⇒  8W = 56 ⇒  W = 7, so L = 21.  
 
The dimensions of the rectangle are 7 feet by 21 feet.