[tex]\boxed{\boxed{\text{Perimeter = 2(Length + Width)}}}[/tex]
Given that the perimeter is 16ft and width is 5 ft,
[tex]16 = 2( Length + 5)[/tex]
Distribute 2:
[tex]16 = 2Length + 10[/tex]
Take away 10 from both sides:
[tex]2Length = 16 - 10[/tex]
Evaluate the right hand side:
[tex]2Length = 6[/tex]
Divide by 2 on both sides:
[tex]Length = 3[/tex]
[tex]\boxed{\boxed{\text{Answer: Length = 3 ft}}}[/tex]
