Question 103909
W=L-5 
PERIMETER=2L+2W
50=2L+2(L-5)
50=2L+2L-10
50=4L-10
4L=50+10
4L=60
L=60/4
L=15 ANSWER FOR THE LENGTH.
W=15-5
W=10 ANSWER FOR THE WIDTH.
PROOF
2*15+2*10=50
30+20=50
50=50