Question 958849
L=3W+4
P=2L+2W
72=2(3W+4)+2W
72=6W+8+2W
72=8W+8
8W=72-8
8W=64
W=64/8
W=8 ANS. 
L=(3*8+4)
L=24+4
L=28 ANS.
PROOF:
72=2*28=2*8
72=56+16
72=72