Question 1085561
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(1)    L = 92 + 3W,  

(2)    L + W + L + W = 760    (perimeter)

====> (92 + 3W) + W + (92+3W) + W = 760.   It is your equation for W.


Simplify:

       8W + 184 = 760,

       8W = 760 - 184

       8W = 576  ====>  W = {{{576/8}}} = 72.
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<U>Answer</U>.  W = 72,  L = 92 + 3*72 = 308.