Hank L. answered 03/13/17
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L = 2W
h=W
LWh = 128
Since L = 2W
and h = W
and 128 = L*W*h
Just do everything in terms of W:
128 = (2W) * W * W
128 = 2W3
64 = W3
W = 4 feet
Since h = W, h also equals 4 feet
And since L = 2W, L = 8 feet