Answer:
Step-by-step explanation:
(A)length of a stamp=1/5foot
wide of a stamp=1/4foot
area of the stamp=?
area of the stamp=length of a stamp *wide of a stamp
                               =1/5*1/4
                               =1/20square foot
(B)an area of the room=1/4  square meter 
width of the room=1/5meter
length of the room=?
an area of the room=width of the room*length of the room
1/4                              =1/5                          *  length of the room
1/4                              = length of the room/5                
5/4                             =length of the room
<h3>
length of the room   =5/4=1 1/4</h3>
(C)the area of the canvas=1/5square yard
width of the canvas=1/4 yard
length of the canvas=?
an area of the  canvas=width of the  canvas*length of the  canvas
 1/5                                = width of the  canvas*1/4
1/5                                 = width of the  canvas/4
4/5                                =width of the  canvas
 width of the  canvas=   4/5
(D)length of the  rectangular course=1/5mile
area of the  rectangular course=1/4square mile
width of the  rectangular course=?
an area of the  rectangular course
                           =
width of the  rectangular course*length of the  rectangular course
1/4                      =width of the  rectangular course*1/5
1/4                      =width of the  rectangular course/5
5/4                     =width of the  rectangular course
width of the  rectangular course=5/4