Question 96986
let the length be L
and the width be w

given L = w + 3

perimeter of a rectangle = 2( l + w)
    therefore we have 
     36 = 2( l + w)
     36=  2( w +3 + w)
  transposing the like terms
    4w =30  
    w=30/4= 7.5
    length = 7.5 + 3 = 10.5


Length=10.5
Width=7.5