Question 847661
l=3w+1 is good
but the
 perimeter is 2w+2l=58
2w+2(3w+1)=58
2w+6w+2=58
8w=56
w=7
l=22

from your 29=??
2w+2l=58
w+l=29
29=3w+1+w
28=4w
7=w
l=22