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Length times width times depth (L x W x D) measures cubic feet and must be measured in feet.
0 0. Since the statement, the length is twice its width  puts one dimension in terms of the other it's easiest to use w as the variable. So, w = width. 2w = length. The perimeter is the sum off all the sides of the rectangle. P = w + w + l + l = 2w + 2l. Using our terms and the value of 60, substitute them into the equation.