I would say the answer is either 48 or 2. Whatever is on the multiple choice
My explanation:
Easy explanation ⬇️
Given length: 48ft
Total area is 96sq. ft
48 + 48 = 96
Second explanation:
Formula to find missing length ⬇️
Area = length x width
96 sq. ft = 48ft x w
96 sq. ft = 48ft x 2
(2 x 48 = 96)
So 2 (probably 48) should be your answer!