SOLUTION: A rectangular garden measures 13 meters by 17 meters and had a cement walkway around its perimeter. The width of the walkway remains constant on all four sides. The gardent and wal

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Question 960318: A rectangular garden measures 13 meters by 17 meters and had a cement walkway around its perimeter. The width of the walkway remains constant on all four sides. The gardent and walkway have a combined area 396 square meters. Determine the width, in metets, of the walkway.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
So many given number values.

Let u, be the uniform width, unknown.
w and L the garden dimensions are KNOWN.
A, the total area of garden plus the walkway.

w=13
L=17
A=396

highlight_green%28%28w%2B2u%29%28L%2B2u%29=A%29

Solve this equation purely symbolically for u, and then substitute the known values to evaluate u. Alternatively, you can substitute for the given values any time you wish during the process and then solve/evaluate u.