Question 939257
perimeter  = 30 feet
let width be x 
length  = 2x-3
 formula : perimeter  =  2(length+width)
        30 = 2((2x-3)+x)
       30 =2( 3x-3)
      divide with 2 on both sides
 {{{30/2  =2 (3x-3)/2}}}
       15 =3x-3
   add 3 on both sides
 15+3 = 3x-3+3
  18 = 3x
  divide with 3 on both sides
  {{{18/3 =3x/3}}}
   6= x
result: width  = 6 feet
 length  = 2*6-3 = 12-3 =9 feet