Question 227268
L=W+30
2L+2W=240
2(W+30)+2W=240
2W+60+2W=240
4W=240-60
4W=180
W=180/4
W=45 ANS. FOR THE WIDTH.
L=45+30
L=75 ANS. FOR THE LENGTH.
PROOF:
2*45+2*75=240
90+150=240
240=240