Question 349769
L=3W+4
2L+2W<=80
2(3W+4)+2W<=80
6W+8+2W<=80
8W<=80-8
8W<=72
W<=72/8
W<=9 ANS. FOR THE WIDTH.
L=3*9+4=27+4=31 ANS. FOR THE LENGTH.
PROOF:
2*31+2*9<=80
62+18<=80
80<=80