Question 324472
L=W+4
P=2L+2W
20=2(W+4)+2W
20=2W+8+2W
20=4W+8
4W=20-8
4W=12
W=12/4
W=3 ANS. FOR THE WIDTH.
L=3+4=7 ANS. FOR THE LENGTH.
PROOF:
20=2*3+2*7
20=6+14
20=20