Question 857589
The perimeter fence around the garden is 192.  That represents 2 pieces of length and 2 pieces of width.
2L + 2W = 192
L = W + 10
Substitute the value of L in the second equation into the first.
2(W+10) + 2W = 192
2W + 20 + 2W = 192
4W + 20 = 192
4W = 172
W = 43
If the width is 43, then the length is 53.
.
Check by building a fence.
43+43+53+53=192
Add
192 = 192
Success!