SOLUTION: A rectangular window has a length that is three times the width, the perimeter is 56 feet, find the length and width of the window

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Question 520103: A rectangular window has a length that is three times the width, the perimeter is 56 feet, find the length and width of the window
Answer by Maths68(1474) About Me  (Show Source):
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Perimeter = P = 56
Length = l = 3w (Given)

Length = ?
Width = ?


Perimeter of rectangel = 2l + 2w

p = 2l + 2w
56 = 2(3w) + 2w
56 = 6w + 2w
56 = 8w
56/8=8w/8
7=w
w=7

Given
Length = l = 3w
Length = l = 3(7)
Length = 21


Perimeter = P = 56 ft.
Length = l = 21 ft.
Width = 7 ft