Question 520103
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