Answer :
Let ℓ equal length, w equal width, and P equal perimeter.
Use the formula 2ℓ + 2w = P.
ℓ = 2w - 5
2ℓ + 2w = 62
Substitute what you do know for what you don't, and solve.
2(2w-5) + 2w = 62
4w - 10 + 2w = 62
6w - 10 = 62
6w = 72
w = (72/6)
w = 12
The answer is 12 feet.