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Boonie0918
Hold on one second and i'll give you the answer.

ampofoeugenia7
The formula for finding the perimeter of a rectangle is P=2(l+w) where P is perimeter, l is the length and, w is width
P=20 ft ,l=7ft but w=?
P=2(l+w)                      6ft=2w
20ft=2(7ft+w)               6ft/2=2w/2
20ft=14ft+2w                   3ft=w
20ft-14ft=14ft-14ft+2w 
Therefore the width is 3ft

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