Question 528732
Let width = x

Then length = 2x-20

Perimeter of the rectangle = 2(Length+Width) 
2( 2x-20+x) = 260
2(3x-20) = 260
3x-20= 130
3x = 130+20
x = 150/3 => 50
Therefore Length = 2x-20 => 2*50-20 => 100-20 => 80

Ans : Length 80 ft, Width 50 ft