Question 1103663
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(1)    L = 2W-10

(2)    L +      W +  L     + W = 178

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      (2W-10) + W + (2W-10) + W = 178  ====>

      6W - 20 = 178  ====>  6W = 178 + 20 = 198  ====>  W = {{{198/6}}} = 33.


<U>Amswer</U>.  W = 33 ft,  L = 2W-10 = 2*33-10 = 56 ft.
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