For this case, the first thing you should do is find the area of the room. We can assume that the room is a rectangle, then the area will be:
 A = (w) * (l)
 Where,
 w: width
 l: long
 Substituting the values we have:
 A = (16) * (20)
 A = 320 feet ^ 2
 We note that each carpet covers only 4 feet ^ 2.
 Therefore the number of carpets will be:
 N = (320) / (4)
 N = 80
 Answer:Â
 andy will need to buy 20 carpet squares to cover the room
