Question 115188
L=W-4
PERIMETER=2W+2L
2W+2(W-4)=68
2W+2W-8=68
4W=68+8
4W=76
W=76/4 
W=19 FEET IS THE WIDTH
L=19-4=15 FEET FOR THE LENGTH.
PROOF
2*19+2*15=68
38+30=68
68=68