Question 116184
A) 2L+2w=62
B) 2(L+21)+2*2w=120
.
B) 
2L+42+4w=120
2L+4w+42-42=120-42
.
2L+4w=78
2L+2w=62
---------Subtract
===>2w=16
2w/2=16/2
w=8 m
.
A) 
2L+16=62
2L+16-16=62-16
2L=46
2L/2=46/2
L=23 m
. 
Ed