Question 281071
L=W+4
2L+2W=20
2(W+4)+2W=20
2W+8+2W=20
4W=20-8
4W=12
W=12/4
W=3 ANS. FOR THE WIDTH.
L=3+4=7 ANS. FOR THE LENGTH.
PROOF:
2*7+2*3=20
14+6=20
20=20