Question 916022
2L + 2W = 72 (the perimeter)
3L (to account for the extra fencing down the middle) + 2W = 88
The difference between the two is 16, so the extra L is 16.
Plug that into the original perimeter equation.
2(16) + 2W = 72
32 + 2W = 72
2W = 40
W = 20